Update flake8 from 3.9.0 to 3.9.1

pyup-bot · pyup-bot · commit 64f766107e8a · 2021-04-16T10:25:39.000+05:30
diff --git a/requirements-testing.txt b/requirements-testing.txt
@@ -1,7 +1,7 @@
 wheel==0.36.2
 python-coveralls==2.9.3
 coverage==5.5
-flake8==3.9.0
+flake8==3.9.1
 pytest==6.2.3
 pytest-cov==2.11.1
 autopep8==1.5.6
