Unable to fake immutable collection properties

[gnalvesteffer]

When attempting to fake types that have immutable collection properties (i.e. IImmutableList), AutoFaker.Generate<T>() throws an exception due to not being able to find a parameterless constructor for the immutable type, since immutable collections are instead created via the type's .Create() method.

[soenneker]

@gnalvesteffer ImmutableList/IImmutableList is now implemented in soenneker.utils.autobogus

Let me know if you have use for other Immutable types.