Updated contributing section of README.
Updated contributing section of README.

derekluo/spree,Ropeney/spree,CJMrozek/spree,beni55/spree,tesserakt/clean_spree,shaywood2/spree,progsri/spree,nooysters/spree,surfdome/spree,ramkumar-kr/spree,yomishra/pce,ujai/spree,urimikhli/spree,shekibobo/spree,bjornlinder/Spree,reidblomquist/spree,moneyspyder/spree,pervino/solidus,KMikhaylovCTG/spree,edgward/spree,StemboltHQ/spree,scottcrawford03/solidus,xuewenfei/solidus,rakibulislam/spree,vinayvinsol/spree,alvinjean/spree,FadliKun/spree,cutefrank/spree,sunny2601/spree,raow/spree,bricesanchez/spree,vulk/spree,patdec/spree,builtbybuffalo/spree,robodisco/spree,SadTreeFriends/spree,forkata/solidus,codesavvy/sandbox,TimurTarasenko/spree,CiscoCloud/spree,reidblomquist/spree,Mayvenn/spree,robodisco/spree,vinsol/spree,NerdsvilleCEO/spree,jparr/spree,useiichi/spree,progsri/spree,mleglise/spree,PhoenixTeam/spree_phoenix,freerunningtech/spree,gautamsawhney/spree,tailic/spree,jparr/spree,woboinc/spree,jasonfb/spree,jhawthorn/spree,alejandromangione/spree,raow/spree,Arpsara/solidus,devilcoders/solidus,lsirivong/spree,richardnuno/solidus,JDutil/spree,lsirivong/solidus,Arpsara/solidus,jasonfb/spree,pervino/solidus,ahmetabdi/spree,agient/agientstorefront,DynamoMTL/spree,mindvolt/spree,tomash/spree,jhawthorn/spree,project-eutopia/spree,sfcgeorge/spree,jimblesm/spree,degica/spree,quentinuys/spree,LBRapid/spree,woboinc/spree,camelmasa/spree,Hates/spree,shekibobo/spree,calvinl/spree,codesavvy/sandbox,Engeltj/spree,freerunningtech/spree,DarkoP/spree,quentinuys/spree,KMikhaylovCTG/spree,azranel/spree,jordan-brough/spree,TimurTarasenko/spree,nooysters/spree,KMikhaylovCTG/spree,delphsoft/spree-store-ballchair,NerdsvilleCEO/spree,calvinl/spree,vulk/spree,yomishra/pce,karlitxo/spree,net2b/spree,pervino/spree,moneyspyder/spree,dotandbo/spree,calvinl/spree,ckk-scratch/solidus,PhoenixTeam/spree_phoenix,Lostmyname/spree,sideci-sample/sideci-sample-spree,DarkoP/spree,Migweld/spree,yushine/spree,HealthWave/spree,shekibobo/spree,progsri/spree,dandanwei/spree,CiscoCloud/spree,sunny2601/spree,archSeer/spree,jeffboulet/spree,DarkoP/spree,HealthWave/spree,builtbybuffalo/spree,azclick/spree,net2b/spree,dafontaine/spree,lzcabrera/spree-1-3-stable,athal7/solidus,kitwalker12/spree,mindvolt/spree,shaywood2/spree,zamiang/spree,Senjai/spree,Hates/spree,bonobos/solidus,gautamsawhney/spree,nooysters/spree,jaspreet21anand/spree,patdec/spree,Senjai/solidus,ckk-scratch/solidus,scottcrawford03/solidus,rakibulislam/spree,madetech/spree,RatioClothing/spree,DynamoMTL/spree,sunny2601/spree,JuandGirald/spree,thogg4/spree,omarsar/spree,sideci-sample/sideci-sample-spree,tomash/spree,biagidp/spree,thogg4/spree,thogg4/spree,TimurTarasenko/spree,Engeltj/spree,jordan-brough/solidus,berkes/spree,groundctrl/spree,lyzxsc/spree,njerrywerry/spree,shekibobo/spree,mleglise/spree,bjornlinder/Spree,hifly/spree,welitonfreitas/spree,pervino/spree,project-eutopia/spree,Migweld/spree,robodisco/spree,piousbox/spree,patdec/spree,miyazawatomoka/spree,kewaunited/spree,wolfieorama/spree,CJMrozek/spree,sunny2601/spree,brchristian/spree,rajeevriitm/spree,orenf/spree,surfdome/spree,Senjai/solidus,alepore/spree,pervino/solidus,Machpowersystems/spree_mach,agient/agientstorefront,TrialGuides/spree,codesavvy/sandbox,vmatekole/spree,dafontaine/spree,Machpowersystems/spree_mach,njerrywerry/spree,agient/agientstorefront,maybii/spree,rakibulislam/spree,builtbybuffalo/spree,trigrass2/spree,alepore/spree,shioyama/spree,jspizziri/spree,CiscoCloud/spree,rajeevriitm/spree,jhawthorn/spree,richardnuno/solidus,Mayvenn/spree,berkes/spree,alvinjean/spree,Boomkat/spree,Migweld/spree,jspizziri/spree,ayb/spree,archSeer/spree,FadliKun/spree,bonobos/solidus,Ropeney/spree,jordan-brough/spree,vmatekole/spree,jaspreet21anand/spree,derekluo/spree,bonobos/solidus,odk211/spree,grzlus/spree,LBRapid/spree,carlesjove/spree,AgilTec/spree,Ropeney/spree,delphsoft/spree-store-ballchair,xuewenfei/solidus,reidblomquist/spree,ramkumar-kr/spree,Nevensoft/spree,rajeevriitm/spree,bjornlinder/Spree,knuepwebdev/FloatTubeRodHolders,dandanwei/spree,Antdesk/karpal-spree,grzlus/solidus,cutefrank/spree,vcavallo/spree,alepore/spree,Hates/spree,woboinc/spree,Lostmyname/spree,StemboltHQ/spree,reinaris/spree,jsurdilla/solidus,jparr/spree,Hawaiideveloper/shoppingcart,beni55/spree,DarkoP/spree,alvinjean/spree,assembledbrands/spree,RatioClothing/spree,CJMrozek/spree,Antdesk/karpal-spree,APohio/spree,PhoenixTeam/spree_phoenix,knuepwebdev/FloatTubeRodHolders,groundctrl/spree,pulkit21/spree,mleglise/spree,useiichi/spree,tancnle/spree,odk211/spree,xuewenfei/solidus,archSeer/spree,gautamsawhney/spree,yiqing95/spree,piousbox/spree,camelmasa/spree,delphsoft/spree-store-ballchair,lyzxsc/spree,progsri/spree,surfdome/spree,ramkumar-kr/spree,abhishekjain16/spree,wolfieorama/spree,NerdsvilleCEO/spree,judaro13/spree-fork,Nevensoft/spree,siddharth28/spree,hoanghiep90/spree,cutefrank/spree,odk211/spree,HealthWave/spree,zamiang/spree,gautamsawhney/spree,CJMrozek/spree,forkata/solidus,ckk-scratch/solidus,welitonfreitas/spree,jimblesm/spree,tesserakt/clean_spree,Hawaiideveloper/shoppingcart,jeffboulet/spree,alejandromangione/spree,abhishekjain16/spree,CiscoCloud/spree,priyank-gupta/spree,pulkit21/spree,camelmasa/spree,agient/agientstorefront,carlesjove/spree,moneyspyder/spree,siddharth28/spree,imella/spree,locomotivapro/spree,beni55/spree,devilcoders/solidus,net2b/spree,ujai/spree,shioyama/spree,piousbox/spree,net2b/spree,radarseesradar/spree,athal7/solidus,jsurdilla/solidus,calvinl/spree,project-eutopia/spree,madetech/spree,tancnle/spree,caiqinghua/spree,orenf/spree,freerunningtech/spree,gregoryrikson/spree-sample,wolfieorama/spree,kewaunited/spree,karlitxo/spree,orenf/spree,vcavallo/spree,rbngzlv/spree,SadTreeFriends/spree,imella/spree,richardnuno/solidus,dandanwei/spree,priyank-gupta/spree,useiichi/spree,vcavallo/spree,kewaunited/spree,quentinuys/spree,derekluo/spree,Nevensoft/spree,codesavvy/sandbox,rajeevriitm/spree,JDutil/spree,hoanghiep90/spree,vinayvinsol/spree,Engeltj/spree,Hates/spree,judaro13/spree-fork,mindvolt/spree,brchristian/spree,sliaquat/spree,Nevensoft/spree,bricesanchez/spree,groundctrl/spree,bonobos/solidus,joanblake/spree,SadTreeFriends/spree,grzlus/solidus,abhishekjain16/spree,Arpsara/solidus,reinaris/spree,keatonrow/spree,athal7/solidus,rbngzlv/spree,pjmj777/spree,KMikhaylovCTG/spree,rakibulislam/spree,vulk/spree,radarseesradar/spree,RatioClothing/spree,madetech/spree,adaddeo/spree,Hawaiideveloper/shoppingcart,vcavallo/spree,sliaquat/spree,jaspreet21anand/spree,firman/spree,ahmetabdi/spree,volpejoaquin/spree,tailic/spree,watg/spree,gregoryrikson/spree-sample,carlesjove/spree,sliaquat/spree,nooysters/spree,trigrass2/spree,trigrass2/spree,fahidnasir/spree,jordan-brough/solidus,omarsar/spree,Mayvenn/spree,yushine/spree,pervino/spree,hifly/spree,yushine/spree,raow/spree,LBRapid/spree,azranel/spree,joanblake/spree,mindvolt/spree,shaywood2/spree,joanblake/spree,carlesjove/spree,urimikhli/spree,jparr/spree,azclick/spree,tancnle/spree,patdec/spree,welitonfreitas/spree,JuandGirald/spree,zaeznet/spree,beni55/spree,forkata/solidus,lsirivong/spree,volpejoaquin/spree,softr8/spree,zaeznet/spree,edgward/spree,raow/spree,sideci-sample/sideci-sample-spree,wolfieorama/spree,zamiang/spree,derekluo/spree,robodisco/spree,Engeltj/spree,JuandGirald/spree,keatonrow/spree,shioyama/spree,tailic/spree,orenf/spree,watg/spree,AgilTec/spree,degica/spree,assembledbrands/spree,surfdome/spree,firman/spree,vinayvinsol/spree,karlitxo/spree,pjmj777/spree,jimblesm/spree,Senjai/spree,Senjai/solidus,yiqing95/spree,volpejoaquin/spree,Kagetsuki/spree,alejandromangione/spree,TrialGuides/spree,tomash/spree,jspizziri/spree,dafontaine/spree,shaywood2/spree,Senjai/spree,groundctrl/spree,thogg4/spree,azranel/spree,JDutil/spree,ayb/spree,njerrywerry/spree,welitonfreitas/spree,adaddeo/spree,gregoryrikson/spree-sample,yomishra/pce,radarseesradar/spree,vinsol/spree,azranel/spree,caiqinghua/spree,TrialGuides/spree,grzlus/solidus,SadTreeFriends/spree,sfcgeorge/spree,piousbox/spree,sfcgeorge/spree,adaddeo/spree,rbngzlv/spree,adaddeo/spree,Boomkat/spree,quentinuys/spree,zaeznet/spree,grzlus/solidus,gregoryrikson/spree-sample,dotandbo/spree,omarsar/spree,locomotivapro/spree,biagidp/spree,PhoenixTeam/spree_phoenix,dotandbo/spree,NerdsvilleCEO/spree,fahidnasir/spree,keatonrow/spree,softr8/spree,AgilTec/spree,bricesanchez/spree,firman/spree,zaeznet/spree,scottcrawford03/solidus,jaspreet21anand/spree,DynamoMTL/spree,jordan-brough/solidus,vmatekole/spree,yushine/spree,sliaquat/spree,urimikhli/spree,Boomkat/spree,locomotivapro/spree,volpejoaquin/spree,archSeer/spree,jsurdilla/solidus,hoanghiep90/spree,FadliKun/spree,kewaunited/spree,imella/spree,lyzxsc/spree,jasonfb/spree,pulkit21/spree,caiqinghua/spree,vinsol/spree,Machpowersystems/spree_mach,lsirivong/spree,ayb/spree,useiichi/spree,tesserakt/clean_spree,azclick/spree,Boomkat/spree,siddharth28/spree,assembledbrands/spree,caiqinghua/spree,karlitxo/spree,lyzxsc/spree,JuandGirald/spree,tesserakt/clean_spree,dandanwei/spree,madetech/spree,tomash/spree,vmatekole/spree,njerrywerry/spree,kitwalker12/spree,forkata/solidus,grzlus/spree,Kagetsuki/spree,ckk-scratch/solidus,builtbybuffalo/spree,edgward/spree,jordan-brough/spree,xuewenfei/solidus,mleglise/spree,camelmasa/spree,hifly/spree,jeffboulet/spree,grzlus/spree,abhishekjain16/spree,jsurdilla/solidus,APohio/spree,yiqing95/spree,sfcgeorge/spree,radarseesradar/spree,delphsoft/spree-store-ballchair,ahmetabdi/spree,degica/spree,cutefrank/spree,jordan-brough/solidus,Ropeney/spree,FadliKun/spree,azclick/spree,lzcabrera/spree-1-3-stable,Lostmyname/spree,jspizziri/spree,alejandromangione/spree,Lostmyname/spree,vinayvinsol/spree,pjmj777/spree,hifly/spree,ramkumar-kr/spree,biagidp/spree,brchristian/spree,omarsar/spree,dotandbo/spree,DynamoMTL/spree,alvinjean/spree,kitwalker12/spree,Kagetsuki/spree,devilcoders/solidus,jeffboulet/spree,lsirivong/solidus,joanblake/spree,TimurTarasenko/spree,odk211/spree,pervino/solidus,scottcrawford03/solidus,knuepwebdev/FloatTubeRodHolders,jasonfb/spree,fahidnasir/spree,vulk/spree,pulkit21/spree,maybii/spree,watg/spree,locomotivapro/spree,Kagetsuki/spree,Antdesk/karpal-spree,athal7/solidus,softr8/spree,reinaris/spree,grzlus/spree,priyank-gupta/spree,hoanghiep90/spree,lsirivong/spree,priyank-gupta/spree,berkes/spree,rbngzlv/spree,softr8/spree,reinaris/spree,edgward/spree,judaro13/spree-fork,trigrass2/spree,yiqing95/spree,maybii/spree,StemboltHQ/spree,project-eutopia/spree,brchristian/spree,JDutil/spree,ayb/spree,ahmetabdi/spree,lsirivong/solidus,maybii/spree,APohio/spree,Mayvenn/spree,devilcoders/solidus,Migweld/spree,lzcabrera/spree-1-3-stable,tancnle/spree,keatonrow/spree,TrialGuides/spree,miyazawatomoka/spree,pervino/spree,zamiang/spree,APohio/spree,lsirivong/solidus,berkes/spree,miyazawatomoka/spree,moneyspyder/spree,vinsol/spree,AgilTec/spree,jimblesm/spree,fahidnasir/spree,ujai/spree,richardnuno/solidus,Senjai/solidus,siddharth28/spree,Arpsara/solidus,dafontaine/spree,miyazawatomoka/spree,Hawaiideveloper/shoppingcart,reidblomquist/spree,firman/spree