Bump pip-check-reqs from 2.1.0 to 2.1.1

Bumps [pip-check-reqs](https://github.com/r1chardj0n3s/pip-check-reqs) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/r1chardj0n3s/pip-check-reqs/releases)
- [Changelog](https://github.com/r1chardj0n3s/pip-check-reqs/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/r1chardj0n3s/pip-check-reqs/commits)

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

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -16,7 +16,7 @@ flake8==3.8.3  # Lint
 freezegun==0.3.15
 isort==4.3.21  # Lint imports
 mypy==0.780  # Type checking
-pip_check_reqs==2.1.0
+pip_check_reqs==2.1.1
 pydocstyle==5.0.2  # Lint docstrings
 pyenchant==3.1.1  # Bindings for a spellchecking sytem
 pygithub==1.51