Log message:
extend PYTHON_VERSIONS_ for Python 3.7

Log message:
devel/py-flufl.i18n: Update to 2.0.1.

2.0.1 (2017-11-14)
- Restore Python 3.4 support.

2.0 (2017-07-24)
- Add _.defer_translation() context manager for marking, but not
  translating a string at the point of use.
- Drop Python 2, 3.3, and 3.4 compatibility; add Python 3.5 and 3.6.
- Switch to the Apache License Version 2.0
- Use flufl.testing for nose2 and flake8 plugins.

Log message:
Import flufl.i18n 1.1.3 as devel/py-flufl.i18n.

The ``flufl.i18n`` library provides a convenient API for managing
translation contexts in Python applications. It provides facilities
not only for single-context applications like command line scripts,
but also more sophisticated management of multiple-context applications
such as Internet servers.