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Pin astroid to fix linter issue on travis #3816
Thanks to fix this!
astroid==1.6.2 was released today and if this contains that bug, that's why it started to happen.
I suggest you to add a comment before the pinned package about why this is happening and a link to the issue also. This is useful later when we want to upgrade, we will know what was happening and can be sure that it's already fixed.