Update changelog.
Update changelog.

Closes #575

supertom/libcloud,apache/libcloud,Kami/libcloud,supertom/libcloud,aleGpereira/libcloud,t-tran/libcloud,mgogoulos/libcloud,StackPointCloud/libcloud,samuelchong/libcloud,iPlantCollaborativeOpenSource/libcloud,atsaki/libcloud,wrigri/libcloud,wrigri/libcloud,techhat/libcloud,mbrukman/libcloud,mathspace/libcloud,supertom/libcloud,StackPointCloud/libcloud,andrewsomething/libcloud,lochiiconnectivity/libcloud,DimensionDataCBUSydney/libcloud,erjohnso/libcloud,apache/libcloud,atsaki/libcloud,pquentin/libcloud,sahildua2305/libcloud,erjohnso/libcloud,wuyuewen/libcloud,niteoweb/libcloud,vongazman/libcloud,wido/libcloud,jimbobhickville/libcloud,mbrukman/libcloud,ByteInternet/libcloud,watermelo/libcloud,ZuluPro/libcloud,aleGpereira/libcloud,NexusIS/libcloud,illfelder/libcloud,jimbobhickville/libcloud,andrewsomething/libcloud,niteoweb/libcloud,t-tran/libcloud,illfelder/libcloud,curoverse/libcloud,lochiiconnectivity/libcloud,curoverse/libcloud,t-tran/libcloud,niteoweb/libcloud,wrigri/libcloud,iPlantCollaborativeOpenSource/libcloud,Kami/libcloud,aleGpereira/libcloud,Kami/libcloud,DimensionDataCBUSydney/libcloud,erjohnso/libcloud,mistio/libcloud,pquentin/libcloud,pquentin/libcloud,sahildua2305/libcloud,watermelo/libcloud,curoverse/libcloud,SecurityCompass/libcloud,mathspace/libcloud,mgogoulos/libcloud,atsaki/libcloud,techhat/libcloud,NexusIS/libcloud,iPlantCollaborativeOpenSource/libcloud,wuyuewen/libcloud,wuyuewen/libcloud,Scalr/libcloud,StackPointCloud/libcloud,techhat/libcloud,sahildua2305/libcloud,watermelo/libcloud,andrewsomething/libcloud,ZuluPro/libcloud,carletes/libcloud,NexusIS/libcloud,SecurityCompass/libcloud,lochiiconnectivity/libcloud,SecurityCompass/libcloud,cryptickp/libcloud,jimbobhickville/libcloud,Scalr/libcloud,samuelchong/libcloud,wido/libcloud,ByteInternet/libcloud,wido/libcloud,mgogoulos/libcloud,vongazman/libcloud,ZuluPro/libcloud,mathspace/libcloud,mbrukman/libcloud,Scalr/libcloud,illfelder/libcloud,DimensionDataCBUSydney/libcloud,apache/libcloud,ByteInternet/libcloud,samuelchong/libcloud,mistio/libcloud,cryptickp/libcloud,carletes/libcloud,mistio/libcloud,carletes/libcloud,cryptickp/libcloud,vongazman/libcloud