Fix py2.6 test

[smurfix]

If you intend to keep #219 open, at least please fix the python2.6 test.

$ python3
Python 3.6.4+ (default, Feb 12 2018, 08:25:03) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.version
'3.6.4+ (default, Feb 12 2018, 08:25:03) \n[GCC 7.3.0]'
>>> 

  File "/src/home-assistant/homeassistant/components/prometheus.py", line 39, in setup
    import prometheus_client
  File "/src/home-assistant/.tox/py36/lib/python3.6/site-packages/prometheus_client/__init__.py", line 4, in <module>
    from . import exposition
  File "/src/home-assistant/.tox/py36/lib/python3.6/site-packages/prometheus_client/exposition.py", line 31, in <module>
    PYTHON26_OR_OLDER = tuple(int(val) for val in sys.version.split()[0].split('.')) < (2, 7, 0)
  File "/src/home-assistant/.tox/py36/lib/python3.6/site-packages/prometheus_client/exposition.py", line 31, in <genexpr>
    PYTHON26_OR_OLDER = tuple(int(val) for val in sys.version.split()[0].split('.')) < (2, 7, 0)
ValueError: invalid literal for int() with base 10: '4+'

[brian-brazil]

Is this still happening with the latest version? I had thought this was fixed.

[hugovk]

This was fixed in PR #227, merged on 19 Dec 2017.

[brian-brazil]

Great.