UML array datatypes do not display properly (#394)

Within a UML diagram I would like to add a return type of Array but it is visually changing it to an equals sign.

Example:

1. click within the UML class object.

2. click "Add Operation"

3. Add a method such as: + FooBar(exampleParam: int[][]) : int[][]

4. Tap enter twice.

and you will see: + FooBar(exampleParam: int = []): int [][]