2.0.0a1

• Calling thenAnswer() without arguments is now allowed and is treated like
  thenReturn() without arguments: the stubbed method will return None.
• Deprecate verifyNoMoreInteractions in favor of ensureNoUnverifiedInteractions.
• Deprecate verifyNoUnwantedInteractions in favor of verifyExpectedInteractions.
• Context managers now check usage and any expectations (set via expect) on exit. The usage
  check can be disabled with the environment variable MOCKITO_CONTEXT_MANAGERS_CHECK_USAGE="0".
• The between matcher now supports open ranges, e.g. between=(0,) to assert that at least
  0 interactions occurred.