Update CHANGELOG for 0.6.3
Update CHANGELOG for 0.6.3

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