Allow usage without calledWith or expectCalledWith

[wh1t3cAt1k]

When setting up mocks without any argument expectations, I get the following message:

Unintended use: Only use default value in combination with .calledWith(..), or use standard mocking without jest-when.

However, I would really rather have a single syntax for mock setups across the whole solution.

I understand that it does not play well linguistically with when, but perhaps a more neutral alias can be exposed, like setupMock, which would not produce this warning.

In fact, I am trying to migrate from a homemade solution where the function is named just that: setupMock.

[timkindberg]

I'm fine with this, if you'd like to submit a PR. Otherwise not sure if/when I'd get around to it.

[timkindberg]

This should now be fixed in v3.4.0