Updated README instructions
Updated README instructions

* Removed annoying $ so that instructions can be copy-pasted.
* Added appropriate syntax highlighting.

Fixes #2506

sideci-sample/sideci-sample-spree,welitonfreitas/spree,dandanwei/spree,omarsar/spree,trigrass2/spree,yiqing95/spree,lsirivong/spree,TimurTarasenko/spree,firman/spree,biagidp/spree,progsri/spree,rakibulislam/spree,vinsol/spree,rbngzlv/spree,ckk-scratch/solidus,kewaunited/spree,KMikhaylovCTG/spree,edgward/spree,zamiang/spree,mleglise/spree,NerdsvilleCEO/spree,Arpsara/solidus,CiscoCloud/spree,tesserakt/clean_spree,scottcrawford03/solidus,mindvolt/spree,dafontaine/spree,nooysters/spree,PhoenixTeam/spree_phoenix,caiqinghua/spree,caiqinghua/spree,JDutil/spree,devilcoders/solidus,joanblake/spree,joanblake/spree,groundctrl/spree,ckk-scratch/solidus,thogg4/spree,omarsar/spree,Lostmyname/spree,joanblake/spree,tailic/spree,adaddeo/spree,sliaquat/spree,welitonfreitas/spree,JDutil/spree,surfdome/spree,biagidp/spree,calvinl/spree,adaddeo/spree,volpejoaquin/spree,RatioClothing/spree,forkata/solidus,njerrywerry/spree,vinsol/spree,LBRapid/spree,shekibobo/spree,hoanghiep90/spree,reinaris/spree,knuepwebdev/FloatTubeRodHolders,cutefrank/spree,delphsoft/spree-store-ballchair,reidblomquist/spree,rakibulislam/spree,lsirivong/solidus,Kagetsuki/spree,Migweld/spree,raow/spree,richardnuno/solidus,dotandbo/spree,biagidp/spree,pervino/spree,StemboltHQ/spree,grzlus/solidus,archSeer/spree,Senjai/spree,pervino/solidus,rakibulislam/spree,TimurTarasenko/spree,KMikhaylovCTG/spree,karlitxo/spree,vulk/spree,Boomkat/spree,JuandGirald/spree,madetech/spree,vinayvinsol/spree,volpejoaquin/spree,maybii/spree,jparr/spree,locomotivapro/spree,dafontaine/spree,keatonrow/spree,project-eutopia/spree,DynamoMTL/spree,AgilTec/spree,priyank-gupta/spree,siddharth28/spree,imella/spree,jasonfb/spree,dafontaine/spree,zamiang/spree,shioyama/spree,camelmasa/spree,alvinjean/spree,lsirivong/solidus,madetech/spree,camelmasa/spree,delphsoft/spree-store-ballchair,rbngzlv/spree,LBRapid/spree,jordan-brough/spree,lyzxsc/spree,archSeer/spree,Engeltj/spree,caiqinghua/spree,karlitxo/spree,lyzxsc/spree,Hawaiideveloper/shoppingcart,TrialGuides/spree,SadTreeFriends/spree,kewaunited/spree,dandanwei/spree,robodisco/spree,ramkumar-kr/spree,alejandromangione/spree,bricesanchez/spree,pulkit21/spree,builtbybuffalo/spree,pervino/spree,vinayvinsol/spree,hoanghiep90/spree,miyazawatomoka/spree,rbngzlv/spree,bricesanchez/spree,moneyspyder/spree,shekibobo/spree,patdec/spree,calvinl/spree,groundctrl/spree,tesserakt/clean_spree,scottcrawford03/solidus,calvinl/spree,gautamsawhney/spree,delphsoft/spree-store-ballchair,watg/spree,xuewenfei/solidus,odk211/spree,gregoryrikson/spree-sample,Ropeney/spree,Ropeney/spree,alepore/spree,radarseesradar/spree,shekibobo/spree,richardnuno/solidus,PhoenixTeam/spree_phoenix,shaywood2/spree,groundctrl/spree,jparr/spree,archSeer/spree,alvinjean/spree,shaywood2/spree,lyzxsc/spree,CiscoCloud/spree,TrialGuides/spree,jeffboulet/spree,alvinjean/spree,locomotivapro/spree,Engeltj/spree,caiqinghua/spree,maybii/spree,CJMrozek/spree,Hates/spree,camelmasa/spree,agient/agientstorefront,welitonfreitas/spree,hoanghiep90/spree,azclick/spree,jordan-brough/spree,assembledbrands/spree,Hawaiideveloper/shoppingcart,bonobos/solidus,woboinc/spree,vcavallo/spree,tancnle/spree,moneyspyder/spree,athal7/solidus,cutefrank/spree,jordan-brough/solidus,abhishekjain16/spree,carlesjove/spree,scottcrawford03/solidus,pervino/spree,odk211/spree,raow/spree,jspizziri/spree,quentinuys/spree,net2b/spree,miyazawatomoka/spree,codesavvy/sandbox,vcavallo/spree,PhoenixTeam/spree_phoenix,pjmj777/spree,freerunningtech/spree,orenf/spree,tancnle/spree,kewaunited/spree,sideci-sample/sideci-sample-spree,lyzxsc/spree,kitwalker12/spree,nooysters/spree,AgilTec/spree,reidblomquist/spree,derekluo/spree,lsirivong/spree,grzlus/solidus,jimblesm/spree,project-eutopia/spree,APohio/spree,wolfieorama/spree,Antdesk/karpal-spree,watg/spree,woboinc/spree,yushine/spree,nooysters/spree,zaeznet/spree,miyazawatomoka/spree,brchristian/spree,Nevensoft/spree,grzlus/solidus,sfcgeorge/spree,orenf/spree,ayb/spree,madetech/spree,Antdesk/karpal-spree,bjornlinder/Spree,jimblesm/spree,rbngzlv/spree,moneyspyder/spree,lsirivong/spree,project-eutopia/spree,karlitxo/spree,tomash/spree,tomash/spree,Senjai/spree,Antdesk/karpal-spree,volpejoaquin/spree,Boomkat/spree,pjmj777/spree,nooysters/spree,jspizziri/spree,pulkit21/spree,Hates/spree,carlesjove/spree,siddharth28/spree,DynamoMTL/spree,builtbybuffalo/spree,KMikhaylovCTG/spree,TrialGuides/spree,Mayvenn/spree,Nevensoft/spree,keatonrow/spree,brchristian/spree,jordan-brough/solidus,AgilTec/spree,jordan-brough/solidus,NerdsvilleCEO/spree,urimikhli/spree,jhawthorn/spree,miyazawatomoka/spree,berkes/spree,rajeevriitm/spree,tancnle/spree,jimblesm/spree,jaspreet21anand/spree,zaeznet/spree,jordan-brough/solidus,firman/spree,DarkoP/spree,PhoenixTeam/spree_phoenix,ahmetabdi/spree,tesserakt/clean_spree,jeffboulet/spree,net2b/spree,reidblomquist/spree,Boomkat/spree,APohio/spree,alejandromangione/spree,NerdsvilleCEO/spree,progsri/spree,useiichi/spree,DynamoMTL/spree,reinaris/spree,trigrass2/spree,Kagetsuki/spree,vulk/spree,azranel/spree,Mayvenn/spree,hifly/spree,sfcgeorge/spree,lsirivong/solidus,dotandbo/spree,sunny2601/spree,wolfieorama/spree,grzlus/spree,jordan-brough/spree,useiichi/spree,jhawthorn/spree,HealthWave/spree,surfdome/spree,reinaris/spree,mindvolt/spree,beni55/spree,SadTreeFriends/spree,pulkit21/spree,reinaris/spree,alepore/spree,vulk/spree,archSeer/spree,builtbybuffalo/spree,trigrass2/spree,azclick/spree,radarseesradar/spree,quentinuys/spree,kewaunited/spree,beni55/spree,TrialGuides/spree,zaeznet/spree,ramkumar-kr/spree,bricesanchez/spree,urimikhli/spree,fahidnasir/spree,patdec/spree,alvinjean/spree,orenf/spree,sideci-sample/sideci-sample-spree,KMikhaylovCTG/spree,jasonfb/spree,dafontaine/spree,mindvolt/spree,brchristian/spree,grzlus/solidus,net2b/spree,jaspreet21anand/spree,pulkit21/spree,jeffboulet/spree,beni55/spree,cutefrank/spree,gautamsawhney/spree,berkes/spree,Ropeney/spree,rajeevriitm/spree,abhishekjain16/spree,jaspreet21anand/spree,fahidnasir/spree,siddharth28/spree,dandanwei/spree,imella/spree,yomishra/pce,Migweld/spree,useiichi/spree,kitwalker12/spree,bjornlinder/Spree,quentinuys/spree,imella/spree,surfdome/spree,urimikhli/spree,sliaquat/spree,ramkumar-kr/spree,radarseesradar/spree,assembledbrands/spree,grzlus/spree,ujai/spree,softr8/spree,jasonfb/spree,shekibobo/spree,rakibulislam/spree,useiichi/spree,xuewenfei/solidus,thogg4/spree,calvinl/spree,Boomkat/spree,LBRapid/spree,ayb/spree,degica/spree,agient/agientstorefront,TimurTarasenko/spree,DarkoP/spree,Senjai/solidus,CiscoCloud/spree,bonobos/solidus,jsurdilla/solidus,CJMrozek/spree,Kagetsuki/spree,APohio/spree,azclick/spree,Ropeney/spree,Hawaiideveloper/shoppingcart,Senjai/solidus,athal7/solidus,CJMrozek/spree,builtbybuffalo/spree,derekluo/spree,tesserakt/clean_spree,degica/spree,pervino/solidus,sunny2601/spree,FadliKun/spree,keatonrow/spree,HealthWave/spree,Senjai/spree,net2b/spree,grzlus/spree,ahmetabdi/spree,vulk/spree,brchristian/spree,StemboltHQ/spree,athal7/solidus,jsurdilla/solidus,dotandbo/spree,APohio/spree,njerrywerry/spree,ujai/spree,jparr/spree,firman/spree,FadliKun/spree,Engeltj/spree,JDutil/spree,grzlus/spree,maybii/spree,firman/spree,DarkoP/spree,Hates/spree,berkes/spree,RatioClothing/spree,yomishra/pce,siddharth28/spree,FadliKun/spree,odk211/spree,Lostmyname/spree,shaywood2/spree,softr8/spree,adaddeo/spree,maybii/spree,ahmetabdi/spree,Hawaiideveloper/shoppingcart,pervino/solidus,Kagetsuki/spree,athal7/solidus,hifly/spree,abhishekjain16/spree,progsri/spree,yiqing95/spree,azranel/spree,StemboltHQ/spree,devilcoders/solidus,moneyspyder/spree,Machpowersystems/spree_mach,sliaquat/spree,raow/spree,pjmj777/spree,forkata/solidus,madetech/spree,jspizziri/spree,Mayvenn/spree,tomash/spree,mleglise/spree,kitwalker12/spree,carlesjove/spree,derekluo/spree,shioyama/spree,Lostmyname/spree,adaddeo/spree,groundctrl/spree,Arpsara/solidus,ayb/spree,ckk-scratch/solidus,mleglise/spree,vmatekole/spree,piousbox/spree,alepore/spree,CiscoCloud/spree,JuandGirald/spree,tailic/spree,rajeevriitm/spree,Nevensoft/spree,hifly/spree,hoanghiep90/spree,vinayvinsol/spree,codesavvy/sandbox,yushine/spree,vcavallo/spree,yiqing95/spree,carlesjove/spree,omarsar/spree,priyank-gupta/spree,sunny2601/spree,scottcrawford03/solidus,dotandbo/spree,azclick/spree,camelmasa/spree,softr8/spree,ayb/spree,shaywood2/spree,Senjai/solidus,fahidnasir/spree,mindvolt/spree,joanblake/spree,locomotivapro/spree,tailic/spree,xuewenfei/solidus,vmatekole/spree,forkata/solidus,CJMrozek/spree,vinsol/spree,thogg4/spree,devilcoders/solidus,abhishekjain16/spree,Lostmyname/spree,jasonfb/spree,jsurdilla/solidus,priyank-gupta/spree,bonobos/solidus,codesavvy/sandbox,gautamsawhney/spree,richardnuno/solidus,ujai/spree,edgward/spree,njerrywerry/spree,JDutil/spree,edgward/spree,AgilTec/spree,JuandGirald/spree,bjornlinder/Spree,devilcoders/solidus,njerrywerry/spree,ahmetabdi/spree,jimblesm/spree,richardnuno/solidus,karlitxo/spree,raow/spree,SadTreeFriends/spree,sliaquat/spree,DarkoP/spree,wolfieorama/spree,freerunningtech/spree,degica/spree,Machpowersystems/spree_mach,Mayvenn/spree,lsirivong/spree,cutefrank/spree,patdec/spree,radarseesradar/spree,edgward/spree,yushine/spree,agient/agientstorefront,gregoryrikson/spree-sample,alejandromangione/spree,beni55/spree,JuandGirald/spree,jhawthorn/spree,yomishra/pce,sfcgeorge/spree,gautamsawhney/spree,robodisco/spree,azranel/spree,ramkumar-kr/spree,sfcgeorge/spree,hifly/spree,keatonrow/spree,ckk-scratch/solidus,freerunningtech/spree,derekluo/spree,vinayvinsol/spree,reidblomquist/spree,zamiang/spree,trigrass2/spree,quentinuys/spree,Arpsara/solidus,volpejoaquin/spree,zamiang/spree,mleglise/spree,tomash/spree,agient/agientstorefront,fahidnasir/spree,Arpsara/solidus,pervino/solidus,RatioClothing/spree,gregoryrikson/spree-sample,HealthWave/spree,sunny2601/spree,omarsar/spree,Senjai/solidus,NerdsvilleCEO/spree,piousbox/spree,vinsol/spree,Machpowersystems/spree_mach,FadliKun/spree,bonobos/solidus,xuewenfei/solidus,jsurdilla/solidus,piousbox/spree,robodisco/spree,knuepwebdev/FloatTubeRodHolders,priyank-gupta/spree,codesavvy/sandbox,delphsoft/spree-store-ballchair,Nevensoft/spree,piousbox/spree,watg/spree,knuepwebdev/FloatTubeRodHolders,rajeevriitm/spree,berkes/spree,alejandromangione/spree,jspizziri/spree,Migweld/spree,orenf/spree,assembledbrands/spree,pervino/spree,jaspreet21anand/spree,thogg4/spree,yushine/spree,lsirivong/solidus,azranel/spree,Migweld/spree,softr8/spree,tancnle/spree,DynamoMTL/spree,vmatekole/spree,TimurTarasenko/spree,SadTreeFriends/spree,robodisco/spree,dandanwei/spree,shioyama/spree,odk211/spree,zaeznet/spree,wolfieorama/spree,forkata/solidus,locomotivapro/spree,project-eutopia/spree,woboinc/spree,jparr/spree,Hates/spree,patdec/spree,Engeltj/spree,yiqing95/spree,gregoryrikson/spree-sample,progsri/spree,vmatekole/spree,surfdome/spree,jeffboulet/spree,vcavallo/spree,welitonfreitas/spree