Unpin flake8 in tox.ini
Currently, flake8 crashes with this error: AttributeError: module 'configparser' has no attribute 'SafeConfigParser'. Did you mean: 'RawConfigParser'? flake8 is pinned to an older version, and unpinning fixes the issue. The original rationale for pinning was until this issue was fixed: https://github.com/savoirfairelinux/flake8-copyright/issues/19 . The issue has been closed, so a simple solution is to unpin it. Change-Id: I6d62514662b7818f52115a914ec43761b728eec5
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