Log Message:
Update devel/py-argcomplete to 1.8.0.

- Simplify nospace handling in global completion (#195)
- Specially handle all characters in COMP_WORDBREAKS (#187)
- Use setuptools tests-require directive, fixes #186
- Complete files using the specified interpreter (#192)
- Fix completion for scripts run via python (#191)
- Clarify argument to register-python-argcomplete (#190)
- Fix handling of commas and other special chars (#172); handle more
  special characters (#189)
- Fix handling of special characters in tcsh (#188)
- Update my_shlex to Python 3.6 version (#184)
- Fix additional trailing space in exact matches (#183)
- Adjust tests to handle development environments (#180)
- Fix tcsh tests on OSX (#177); Update bash on OSX (#176); Check output
  of test setup command (#179)
- Optionally disable duplicated flags (#143)
- Add default_completer option to CompletionFinder.call (#167)
- Let bash add or suppress trailing space (#159)