Sourcery fails to generate valid mocks for Nested Protocols

[szilipeti95]

The problem is related to Swift's proposal for Nested Protocols. Sourcery is unable to generate valid mocks for nested protocols because it encounters invalid class names when it tries to generate the mock implementations.

With this proposal it is possible to define protocols like this:

class MyClass {
    // sourcery: AutoMockable
    protocol MyProtocol {
    }
}

Sourcery generates the following code which results in invalid class names:

class MyClass.MyProtocolMock: MyClass.MyProtocol {
}

The correct generated code should be:

class MyClassMyProtocolMock: MyClass.MyProtocol {
}

I know this is an experimental feature, but it would be great if Sourcery could support this.