Update flake8 from 3.8.4 to 3.9.0

pyup-bot · pyup-bot · commit 72ae2fa68e67 · 2021-03-15T06:25:19.000+05:30
diff --git a/requirements-testing.txt b/requirements-testing.txt
@@ -1,6 +1,6 @@
 python-coveralls==2.9.3
 coverage==5.5
-flake8==3.8.4
+flake8==3.9.0
 pytest==6.2.2
 pytest-cov==2.11.1
 autopep8==1.5.5
