Hi team. I noticed that `MapGetWithNotNullAssertio...

# detekt

[Travis Miehm]

Hi team. I noticed that MapGetWithNotNullAssertionOperator does not report violations on MutableMap. Any idea if that's intended? If it's not and is a desired change, I can send a PR, I've got a passing test locally.

[Travis Miehm]

Created an issue for tracking