Update contributing guide with new release policy branches
Update contributing guide with new release policy branches

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