updated CHANGES.rst for #821
updated CHANGES.rst for #821

pquentin/libcloud,DimensionDataCBUSydney/libcloud,SecurityCompass/libcloud,StackPointCloud/libcloud,Kami/libcloud,Scalr/libcloud,ZuluPro/libcloud,watermelo/libcloud,NexusIS/libcloud,ZuluPro/libcloud,wuyuewen/libcloud,ByteInternet/libcloud,iPlantCollaborativeOpenSource/libcloud,andrewsomething/libcloud,ZuluPro/libcloud,iPlantCollaborativeOpenSource/libcloud,StackPointCloud/libcloud,mgogoulos/libcloud,DimensionDataCBUSydney/libcloud,SecurityCompass/libcloud,mgogoulos/libcloud,DimensionDataCBUSydney/libcloud,illfelder/libcloud,illfelder/libcloud,wuyuewen/libcloud,illfelder/libcloud,mistio/libcloud,apache/libcloud,samuelchong/libcloud,ByteInternet/libcloud,watermelo/libcloud,erjohnso/libcloud,StackPointCloud/libcloud,mistio/libcloud,t-tran/libcloud,andrewsomething/libcloud,samuelchong/libcloud,SecurityCompass/libcloud,vongazman/libcloud,lochiiconnectivity/libcloud,mistio/libcloud,Kami/libcloud,wuyuewen/libcloud,erjohnso/libcloud,pquentin/libcloud,lochiiconnectivity/libcloud,samuelchong/libcloud,watermelo/libcloud,techhat/libcloud,t-tran/libcloud,Scalr/libcloud,Scalr/libcloud,Kami/libcloud,vongazman/libcloud,lochiiconnectivity/libcloud,iPlantCollaborativeOpenSource/libcloud,techhat/libcloud,t-tran/libcloud,NexusIS/libcloud,mgogoulos/libcloud,apache/libcloud,erjohnso/libcloud,techhat/libcloud,NexusIS/libcloud,pquentin/libcloud,apache/libcloud,vongazman/libcloud,andrewsomething/libcloud,ByteInternet/libcloud