Add capybara to gemspec
Add capybara to gemspec

calfzhou/doorkeeper,6fusion/doorkeeper,mavenlink/doorkeeper,calfzhou/doorkeeper,ifeelgoods/doorkeeper,ministryofjustice/doorkeeper,Uysim/doorkeeper,GeekOnCoffee/doorkeeper,doorkeeper-gem/doorkeeper,kolorahl/doorkeeper,ukasiu/doorkeeper,dollarshaveclub/doorkeeper,ifeelgoods/doorkeeper,ValMilkevich/doorkeeper,nbulaj/doorkeeper,daande/doorkeeper,ezilocchi/doorkeeper,CloudTags/doorkeeper,EasterAndJay/doorkeeper,dk1234567/doorkeeper,outstand/doorkeeper,pmdeazeta/doorkeeper,lalithr95/doorkeeper,nbulaj/doorkeeper,vanboom/doorkeeper,coinbase/modified-doorkeeper,outstand/doorkeeper,Tout/doorkeeper,moneytree/doorkeeper,dollarshaveclub/doorkeeper,outstand/doorkeeper,kolorahl/doorkeeper,ValMilkevich/doorkeeper,vovimayhem/doorkeeper,jasl/doorkeeper,GeekOnCoffee/doorkeeper,CloudTags/doorkeeper,doorkeeper-gem/doorkeeper,identification-io/doorkeeper,ministryofjustice/doorkeeper,moneytree/doorkeeper,doorkeeper-gem/doorkeeper,Uysim/doorkeeper,telekomatrix/doorkeeper,mavenlink/doorkeeper,CloudTags/doorkeeper,CloudTags/doorkeeper,dk1234567/doorkeeper,stormz/doorkeeper,AICIDNN/doorkeeper,ukasiu/doorkeeper,ngpestelos/doorkeeper,jasl/doorkeeper,pmdeazeta/doorkeeper,stefania11/doorkeeper,AdStage/doorkeeper,jasl/doorkeeper,vanboom/doorkeeper,phillbaker/doorkeeper,shivakumaarmgs/doorkeeper,coinbase/modified-doorkeeper,ngpestelos/doorkeeper,identification-io/doorkeeper,vovimayhem/doorkeeper,Tout/doorkeeper,AdStage/doorkeeper,mavenlink/doorkeeper,EasterAndJay/doorkeeper,shivakumaarmgs/doorkeeper,ezilocchi/doorkeeper,telekomatrix/doorkeeper,ifeelgoods/doorkeeper,Tout/doorkeeper,lalithr95/doorkeeper,AICIDNN/doorkeeper,coinbase/modified-doorkeeper,daande/doorkeeper,stormz/doorkeeper,6fusion/doorkeeper,stefania11/doorkeeper