Prepare changelog for v0.6.0
Prepare changelog for v0.6.0

KentShikama/vector-web,vector-im/vector-web,KentShikama/vector-web,KentShikama/vector-web,vector-im/vector-web,vector-im/riot-web,vector-im/vector-web,vector-im/vector-web,KentShikama/vector-web,KentShikama/vector-web,vector-im/riot-web,vector-im/riot-web,vector-im/riot-web,martindale/vector,martindale/vector,vector-im/vector-web,vector-im/riot-web,KentShikama/vector-web,vector-im/riot-web