Update Changelog for upcoming v4.0 release
Update Changelog for upcoming v4.0 release

AlchemyCMS/alchemy_cms,chalmagean/alchemy_cms,mamhoff/alchemy_cms,mixandgo/alchemy_cms,mamhoff/alchemy_cms,AlchemyCMS/alchemy_cms,mixandgo/alchemy_cms,mtomov/alchemy_cms,robinboening/alchemy_cms,mtomov/alchemy_cms,mixandgo/alchemy_cms,robinboening/alchemy_cms,mamhoff/alchemy_cms,chalmagean/alchemy_cms,chalmagean/alchemy_cms,AlchemyCMS/alchemy_cms,mixandgo/alchemy_cms,mtomov/alchemy_cms,chalmagean/alchemy_cms,mtomov/alchemy_cms,robinboening/alchemy_cms