build(deps): bump flake8 from 3.8.3 to 3.8.4

dependabot-preview[bot] · dependabot-preview[bot] · commit 4de85f5406b6 · 2020-10-05T13:21:20.000Z
Bumps [flake8](https://gitlab.com/pycqa/flake8) from 3.8.3 to 3.8.4. - [Release notes](https://gitlab.com/pycqa/flake8/tags) - [Commits](https://gitlab.com/pycqa/flake8/compare/3.8.3...3.8.4) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
diff --git a/linter-requirements.txt b/linter-requirements.txt
@@ -1,5 +1,5 @@
 black==20.8b1
-flake8==3.8.3
+flake8==3.8.4
 flake8-import-order==0.18.1
 mypy==0.782
 flake8-bugbear==20.1.4
