Bump flake8-bugbear from 19.3.0 to 19.8.0

Bumps [flake8-bugbear](https://github.com/PyCQA/flake8-bugbear) from 19.3.0 to 19.8.0.
- [Release notes](https://github.com/PyCQA/flake8-bugbear/releases)
- [Commits](https://github.com/PyCQA/flake8-bugbear/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

setup.py

@@ -8,7 +8,7 @@
     "tests": ["pytest", "mock"],
     "lint": [
         "flake8==3.7.8",
-        'flake8-bugbear==19.3.0; python_version >= "3.5"',
+        'flake8-bugbear==19.8.0; python_version >= "3.5"',
         "pre-commit~=1.17",
     ],
     "docs": ["sphinx==2.2.0", "alabaster==0.7.12", "sphinx-issues==1.2.0"],