Update json gem to 2.1.0 (#202)
Update json gem to 2.1.0 (#202)

When building locally, json 1.8.3 fails to install when running bundle install. Version 2.1.0 works.
khaind/khaind.github.io,chasingrelativity/chasingrelativity.github.io,d-cullen/d-cullen.github.io,mpccolorado/mpccolorado.github.io,animaze97/animaze97.github.io,khoparzi/khoparzi.github.io,aharrison24/aharrison24.github.io,AjinkyaGhadge/ajinkyaghadge.github.io,pgonzalezesp/pgonzalezesp.github.io,KevinRPan/kevinrpan.github.io,HarrisChu/harrischu.github.io,daattali/beautiful-jekyll,apryor6/apryor6.github.io,nathancunn/nathancunn.github.io,nathancunn/nathancunn.github.io,samterrones/samterrones.github.io,mmuras-vmse/mmuras-vmse.github.io,sostenibilidad-unam/sostenibilidad-unam.github.io,kodero/kodero.github.io,quangvo09/quangvo09.github.io,CarloMicieli/carlomicieli.github.io,chasingrelativity/chasingrelativity.github.io,Melyanna/Melyanna.github.io,ngotungson/ngotungson.github.io,sfxfactor/beautiful-jekyll,Punsach/Punsach.github.io,annegentle/beautiful-jekyll,rodrigoportela/rodrigoportela.github.io,israelg99/israelg99.github.io,rava-dosa/rava-dosa.github.io,deniseoyston/deniseoyston.github.io,sa000/sa000.github.io,arunkishore/arunkishore.github.io,praveer09/praveer09.github.io,genfire-em/genfire-em.github.io,CarloMicieli/carlomicieli.github.io,yonicd/yonicd.github.io,linnovate/meansite,koju/koju.github.io,nikeipt/nikeipt.github.io,Dejulia489/Dejulia489.github.io,baldoequeiroz/baldoequeiroz.github.io,uraplutonium/uraplutonium.github.io,ceroberoz/ceroberoz.github.io,hanifidemirel/hanifidemirel.github.io,kinshuk4/kinshuk4.github.io,adrianotanaka/adrianotanaka.github.io,linnovate/meansite,shaunxu/shaunxu.github.io,balcikonis/jbg-alumni-website,tvpollet/tvpollet.github.io,Jeremias-Brand/Jeremias-Brand.github.io,Manu343726/Manu343726.github.io,Dejulia489/Dejulia489.github.io,nikeipt/nikeipt.github.io,beyondnebula/beyondnebula.github.io,dm4r/dm4r.github.io,deniseoyston/deniseoyston.github.io,HarrisChu/harrischu.github.io,zx8754/zx8754.github.io,zazuafrica/newblog,MattiasWoldu/mattiaswoldu.github.io,kinshuk4/kinshuk4.github.io,aharrison24/aharrison24.github.io,arunkishore/arunkishore.github.io,twisted-fun/twisted-fun.github.io,tvpollet/tvpollet.github.io,praveer09/praveer09.github.io,bernardLis/bernardLis,Aishwarya-NR/Aishwarya-NR.github.io,sfxfactor/sfxfactor.github.io,dborisenko/dborisenko.github.io,daanalytics/daanalytics.github.io,cbalfour/cbalfour.github.io,adrianotanaka/adrianotanaka.github.io,acodega/acodega.github.io,alok123t/alok123t.github.io,acodega/acodega.github.io,koju/koju.github.io,chasingrelativity/chasingrelativity.github.io,nycon/nycon.github.io,tollfreegr/tollfreegr.github.io,sfxfactor/sfxfactor.github.io,the-real-awittmann/the-real-awittmann.github.io,emir01/emir01.github.io,martin2250/martin2250.github.io,suchit-upx/suchit-upx.github.io,emir01/emir01.github.io,balcikonis/jbg-alumni-website,nycon/nycon.github.io,LestherSK/LestherSK.github.io,khoparzi/khoparzi.github.io,khaind/khaind.github.io,fthsvk/fthsvk.github.io,kodero/kodero.github.io,zazuafrica/newblog,antnh6/my-personal-site,dborisenko/dborisenko.github.io,antnh6/my-personal-site,fridewald/fridewald.github.io,daranzolin/daranzolin.github.io,dm4r/dm4r.github.io,toicodedoec/toicodedoec.github.io,shwetkm/shwetkm.github.io,guilhermevinche/guilhermevinche.github.io,adityachivu/adityachivu.github.io,sa000/sa000.github.io,netravnen/netravnen.github.io,martinus/martinus.github.io,Jkassof/Jkassof.github.io,nathancunn/nathancunn.github.io,purplemunster/purplemunster.github.io,jodenoy/jodenoy.github.io,hanifidemirel/hanifidemirel.github.io,sostenibilidad-unam/sostenibilidad-unam.github.io,Elena7/Elena7.github.io,quagzy/quagzy.github.io,annegentle/beautiful-jekyll,AOnurOzcan/AOnurOzcan.github.io,gorkemmeral/gorkemmeral.github.io,quangvo09/quangvo09.github.io,acodega/acodega.github.io,rava-dosa/rava-dosa.github.io,tvojotecexample/tvojotecexample.github.io,KonstaT/KonstaT.github.io,lhubbard01/lhubbard01.github.io,larryleihua/larryleihua.github.io,shibaFoss/shibafoss.github.io,inonchiu/inonchiu.github.io,dm4r/dm4r.github.io,inonchiu/inonchiu.github.io,toicodedoec/toicodedoec.github.io,shibaFoss/shibafoss.github.io,ALeggeUp/confagrid,khaind/khaind.github.io,the-real-awittmann/the-real-awittmann.github.io,deniseoyston/deniseoyston.github.io,StanleyGan/StanleyGan.github.io,VeriS-CyLab/VeriS-CyLab.github.io,HarshalBhoir/harshalbhoir.github.io,MattiasWoldu/mattiaswoldu.github.io,larryleihua/larryleihua.github.io,Crazedwish/crazedwish.github.io,linnovate/meansite,archphile/archphile.github.io,genfire-em/genfire-em.github.io,quagzy/quagzy.github.io,LestherSK/LestherSK.github.io,sfxfactor/sfxfactor.github.io,yonicd/yonicd.github.io,sipart/sipart.github.io,martin2250/martin2250.github.io,martinus/martinus.github.io,arunkishore/arunkishore.github.io,VeriS-CyLab/VeriS-CyLab.github.io,LestherSK/LestherSK.github.io,Jeremias-Brand/Jeremias-Brand.github.io,FabriDamazio/FabriDamazio.github.io,ngallo/ngallo.github.io,bernardLis/bernardLis,shaunxu/shaunxu.github.io,archphile/archphile.github.io,Ricardo-Garrido/Ricardo-Garrido.github.io,daattali/beautiful-jekyll,mateusz1981/beautiful-jekyll,shwetkm/shwetkm.github.io,dborisenko/dborisenko.github.io,JosemyDuarte/josemyduarte.github.io,Elena7/Elena7.github.io,dseuss/dseuss.github.io,sfxfactor/beautiful-jekyll,tollfreegr/tollfreegr.github.io,Aishwarya-NR/Aishwarya-NR.github.io,johannesharmse/johannesharmse.github.io,zazuafrica/newblog,baldoequeiroz/baldoequeiroz.github.io,sostenibilidad-unam/sostenibilidad-unam.github.io,larryleihua/larryleihua.github.io,Punsach/Punsach.github.io,saifkabirasif/saifkabirasif.github.io,mfwit/mfwit.github.io,JosemyDuarte/josemyduarte.github.io,KevinRPan/kevinrpan.github.io,db7894/db7894.github.io,rinuel/rinuel.github.io,ALeggeUp/confagrid,mpccolorado/mpccolorado.github.io,apryor6/apryor6.github.io,rava-dosa/rava-dosa.github.io,aharrison24/aharrison24.github.io,cbalfour/cbalfour.github.io,johannesharmse/johannesharmse.github.io,AjinkyaGhadge/ajinkyaghadge.github.io,mpccolorado/mpccolorado.github.io,samterrones/samterrones.github.io,samterrones/samterrones.github.io,sa000/sa000.github.io,fthsvk/fthsvk.github.io,yonicd/yonicd.github.io,martin2250/martin2250.github.io,martinus/martinus.github.io,netravnen/netravnen.github.io,lhubbard01/lhubbard01.github.io,ssebbass/ssebbass.com,hanifidemirel/hanifidemirel.github.io,fakelife2017/fakelife2017.github.io,israelg99/israelg99.github.io,harishneit/website,twisted-fun/twisted-fun.github.io,daranzolin/daranzolin.github.io,pgonzalezesp/pgonzalezesp.github.io,d-cullen/d-cullen.github.io,gorkemmeral/gorkemmeral.github.io,Jkassof/Jkassof.github.io,antnh6/my-personal-site,HarrisChu/harrischu.github.io,StanleyGan/StanleyGan.github.io,sipart/sipart.github.io,Jkassof/Jkassof.github.io,kodero/kodero.github.io,jmreekes/jmreekes.github.io,KonstaT/KonstaT.github.io,d-cullen/d-cullen.github.io,JosemyDuarte/josemyduarte.github.io,animaze97/animaze97.github.io,dseuss/dseuss.github.io,suchit-upx/suchit-upx.github.io,foocheung/foocheung.github.io,lhubbard01/lhubbard01.github.io,apryor6/apryor6.github.io,AjinkyaGhadge/ajinkyaghadge.github.io,johannesharmse/johannesharmse.github.io,martinus/martinus.github.io,kunalspathak/kunalspathak.github.io,baldoequeiroz/baldoequeiroz.github.io,mfwit/mfwit.github.io,dvdwright99/dvdwright99.github.io,sunilshahi/sunilshahi.github.io,beyondnebula/beyondnebula.github.io,bhscs/bhscs.github.io,beyondnebula/beyondnebula.github.io,krisrice/krisrice.io,daanalytics/daanalytics.github.io,martin2250/martin2250.github.io,smfactor/smfactor.github.io,ALeggeUp/confagrid,ALeggeUp/confagrid,AOnurOzcan/AOnurOzcan.github.io,Ricardo-Garrido/Ricardo-Garrido.github.io,chrfritsch/chrfritsch.github.io,fridewald/fridewald.github.io,twisted-fun/twisted-fun.github.io,mmuras-vmse/mmuras-vmse.github.io,fthsvk/fthsvk.github.io,LestherSK/LestherSK.github.io,smfactor/smfactor.github.io,d-cullen/d-cullen.github.io,ceroberoz/ceroberoz.github.io,tvojotecexample/tvojotecexample.github.io,zx8754/zx8754.github.io,dvdwright99/dvdwright99.github.io,ngallo/ngallo.github.io,erikcox/erikcox.github.io,fakelife2017/fakelife2017.github.io,antnh6/my-personal-site,rinuel/rinuel.github.io,HarshalBhoir/harshalbhoir.github.io,quagzy/quagzy.github.io,zx8754/zx8754.github.io,praveer09/praveer09.github.io,martinus/martinus.github.io,HarshalBhoir/harshalbhoir.github.io,the-real-awittmann/the-real-awittmann.github.io,fridewald/fridewald.github.io,aauthor/aauthor.github.io,shibaFoss/shibafoss.github.io,Jeremias-Brand/Jeremias-Brand.github.io,adrianotanaka/adrianotanaka.github.io,sipart/sipart.github.io,apryor6/apryor6.github.io,guilhermevinche/guilhermevinche.github.io,harishneit/website,animaze97/animaze97.github.io,Manu343726/Manu343726.github.io,ssebbass/ssebbass.com,ngallo/ngallo.github.io,fakelife2017/fakelife2017.github.io,dvdwright99/dvdwright99.github.io,shaunxu/shaunxu.github.io,biobenkj/biobenkj.github.io,Elena7/Elena7.github.io,nathancunn/nathancunn.github.io,MattiasWoldu/mattiaswoldu.github.io,jodenoy/jodenoy.github.io,krisrice/krisrice.io,StanleyGan/StanleyGan.github.io,inonchiu/inonchiu.github.io,netravnen/netravnen.github.io,Crazedwish/crazedwish.github.io,db7894/db7894.github.io,yonicd/yonicd.github.io,alok123t/alok123t.github.io,tvojotecexample/tvojotecexample.github.io,Crazedwish/crazedwish.github.io,Dejulia489/Dejulia489.github.io,ngotungson/ngotungson.github.io,sunilshahi/sunilshahi.github.io,dseuss/dseuss.github.io,sunilshahi/sunilshahi.github.io,saifkabirasif/saifkabirasif.github.io,archphile/archphile.github.io,daanalytics/daanalytics.github.io,alok123t/alok123t.github.io,daranzolin/daranzolin.github.io,apryor6/apryor6.github.io,ceroberoz/ceroberoz.github.io,purplemunster/purplemunster.github.io,foocheung/foocheung.github.io,krisrice/krisrice.io,annegentle/beautiful-jekyll,Aishwarya-NR/Aishwarya-NR.github.io,adityachivu/adityachivu.github.io,bernardLis/bernardLis,tvpollet/tvpollet.github.io,koju/koju.github.io,pgonzalezesp/pgonzalezesp.github.io,jmreekes/jmreekes.github.io,ngotungson/ngotungson.github.io,emir01/emir01.github.io,VeriS-CyLab/VeriS-CyLab.github.io,cbalfour/cbalfour.github.io,alok123t/alok123t.github.io,jodenoy/jodenoy.github.io,nikeipt/nikeipt.github.io,Ricardo-Garrido/Ricardo-Garrido.github.io,sfxfactor/beautiful-jekyll,quangvo09/quangvo09.github.io,greenbrettmichael/greenbrettmichael.github.io,toicodedoec/toicodedoec.github.io,khoparzi/khoparzi.github.io,ssebbass/ssebbass.com,bhscs/bhscs.github.io,adityachivu/adityachivu.github.io,Manu343726/Manu343726.github.io,jmreekes/jmreekes.github.io,mateusz1981/beautiful-jekyll,daattali/beautiful-jekyll,uraplutonium/uraplutonium.github.io,KevinRPan/kevinrpan.github.io,smfactor/smfactor.github.io,erikcox/erikcox.github.io,guilhermevinche/guilhermevinche.github.io,biobenkj/biobenkj.github.io,genfire-em/genfire-em.github.io,Melyanna/Melyanna.github.io,balcikonis/jbg-alumni-website,tvpollet/tvpollet.github.io,shwetkm/shwetkm.github.io,AOnurOzcan/AOnurOzcan.github.io,gorkemmeral/gorkemmeral.github.io,ALeggeUp/confagrid,foocheung/foocheung.github.io,nycon/nycon.github.io,ssebbass/ssebbass.com,Melyanna/Melyanna.github.io,kunalspathak/kunalspathak.github.io,suchit-upx/suchit-upx.github.io,yonicd/yonicd.github.io,Punsach/Punsach.github.io,CarloMicieli/carlomicieli.github.io,db7894/db7894.github.io,uraplutonium/uraplutonium.github.io,israelg99/israelg99.github.io,harishneit/website,FabriDamazio/FabriDamazio.github.io,KonstaT/KonstaT.github.io,tollfreegr/tollfreegr.github.io,x3r/x3r.github.io,mmuras-vmse/mmuras-vmse.github.io,bhscs/bhscs.github.io,twisted-fun/twisted-fun.github.io