⬆️ Bump pre-commit from 1.18.3 to 1.19.0 (#24)

Bumps [pre-commit](https://github.com/pre-commit/pre-commit) from 1.18.3 to 1.19.0.
- [Release notes](https://github.com/pre-commit/pre-commit/releases)
- [Changelog](https://github.com/pre-commit/pre-commit/blob/master/CHANGELOG.md)
- [Commits](pre-commit/pre-commit@v1.18.3...v1.19.0)

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

Author: dependabot-preview[bot]

requirements_dev.txt

@@ -2,7 +2,7 @@ autopep8==1.4.4
 black==19.3b0
 blacken-docs==1.3.0
 pip==19.3.1
-pre-commit==1.18.3
+pre-commit==1.19.0
 Sphinx==2.2.1
 twine==2.0.0
 wheel==0.33.6