Astroid incompatibility

[ZuluPro]

Latest version of astroid seems to break prospector.

They remove the YES constant, replaced by Uninferable.

File "/builds/cs/cb/.tox/lint/lib/python3.5/site-packages/pylint_django/__init__.py", line 6, in <module>
    from pylint_django import plugin
  File "/builds/cs/cb/.tox/lint/lib/python3.5/site-packages/pylint_django/plugin.py", line 5, in <module>
    from pylint_django.checkers import register_checkers
  File "/builds/cs/cb/.tox/lint/lib/python3.5/site-packages/pylint_django/checkers/__init__.py", line 3, in <module>
    from pylint_django.checkers.models import ModelChecker
  File "/builds/cs/cb/.tox/lint/lib/python3.5/site-packages/pylint_django/checkers/models.py", line 11, in <module>
    from pylint_django.utils import node_is_subclass, PY3
  File "/builds/cs/cb/.tox/lint/lib/python3.5/site-packages/pylint_django/utils.py", line 4, in <module>
    from astroid.util import YES
ImportError: cannot import name 'YES'```

[carlio]

1.1.6.2 now released with the small hotfix to pin versions - let me know if there are any further bugs but I think this will be closed as long as you upgrade prospector.

For now that will work though the underlying issue is with pylint-django : pylint-dev/pylint-django#201