Fixed grammar in contributing guide
Fixed grammar in contributing guide

Related to #110

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