test-requirements: bump pyflakes to get f-strings support

Message ID 695796@If9113306aa7a652dd0d9f2c8bff8f64f639cfdbd
State Accepted
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Message

Marcin Juszkiewicz Nov. 23, 2019, 11:57 a.m.
Project: openstack/kolla
https://review.openstack.org/#/c/695796/

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