Python-openflow

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No major changes since the last pre-release.

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Added
=====
- Added a string representation method to ``GroupMod``,
``Header``, ``Bucket``, ``ActionSetField`` and ``ActionOutput``.

Changed
=======
- Changed ``setup.py`` to run ``pytest-runner`` only during the unit tests.
- Let Scrutinizer CI choose which Python 3.6 it'll use for tests.

Fixed
=====
- Fixed ``PackException`` error when running Kytos with OpenFlow 1.0 (631).
- Fixed docstrings in ``UBIntBase`` and ``TableFeatures`` classes.

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No changes since rc1.

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Added
=====
- Added support to native method int() in UBInt() class
- Added unit tests for UBInt8, UBInt64 and UBInt128 class

Changed
=======
- Standardize ``isenum`` to ``is_enum``

Fixed
=====
- Fixed "Recursion error" when building documentation with Sphinx >= 2.1

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Added
=====
- Added Python 3.[789] classifiers to ``setup.py``

Removed
=======
- Removed Python 3.6 references from ``README.rst`` and ``Makefile``

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Added
=====
- Added minimum_size tests to FlowMod and VendorHeader

Changed
=======
- Fail test instead of skipping if no minimum_size is defined