Log Message:
py-flexmock: updated to 0.10.4

Release 0.10.4
- drop Python 2.6, 3.3 and Jython support
- add Python 3.6 and 3.7 support
- don't hide exception when flexmock is used as context manager
- fix expectation reset for static methods on pypy 2
- ensure original exception isn't suppressed in pytest hook