Updated changelog for 1.5
Updated changelog for 1.5

alignd/libPusher,lukeredpath/libPusher,andreaperizzato/libPusher,andreaperizzato/libPusher,hamchapman/libPusher,lukeredpath/libPusher,LoyoChengdu/libPusher,andreaperizzato/libPusher,LoyoChengdu/libPusher,hamchapman/libPusher,alignd/libPusher,lukeredpath/libPusher,hamchapman/libPusher,LoyoChengdu/libPusher,hamchapman/libPusher,lukeredpath/libPusher,alignd/libPusher,LoyoChengdu/libPusher,andreaperizzato/libPusher,alignd/libPusher