2.0.0a4

• Allow ... in fixed argument positions as an ad-hoc any matcher.
  Trailing positional ... keeps its existing "rest" semantics.

• Expanded mock({...}) constructor shorthands. Refer https://mockito-python.readthedocs.io/en/latest/mock-shorthands.html

• Added chained stubbing and expectations across call/property hops, e.g.
  when(cat).meow().purr().thenReturn(...), when(User).query.filter_by(...).first(), and
  expect(cat, times=1).meow().purr(), including cleanup that preserves sibling chain branches.

• BREAKING: Stubs for the same method are now sorted by specificity. #110 Rolled back in a5.

  Same-ish are for example

  when(os.path).exists(...).thenCallOriginalImplementation()
  when(os.path).exists('.flake8').thenReturn(False)