v0.4.1

• Fixed a bug in WorkspaceDictionary.keys that will show deleted keys
• Added WorkspaceDictionary.removeAll(). This should be faster than iterating through keys and remove each of them.
• Added await interface for Workspace.performChanges
• Support specify type when accessing WorkspaceDictionary, for example: dictionary["someKey", Int.self]
• Updated with benchmarks for WorkspaceDictionary