build(deps-dev): bump plexhints from 0.1.1 to 0.1.2

Bumps [plexhints](https://github.com/LizardByte/plexhints) from 0.1.1 to 0.1.2.
- [Release notes](https://github.com/LizardByte/plexhints/releases)
- [Changelog](https://github.com/LizardByte/plexhints/blob/nightly/CHANGELOG.md)
- [Commits](LizardByte/plexhints@v0.1.1...v0.1.2)

---
updated-dependencies:
- dependency-name: plexhints
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

requirements-dev.txt

@@ -2,7 +2,7 @@
 flake8==3.9.2;python_version<"3"
 m2r2==0.3.2;python_version<"3"
 numpydoc==0.9.2;python_version<"3"
-plexhints==0.1.1  # type hinting library for plex development
+plexhints==0.1.2  # type hinting library for plex development
 pytest==4.6.11;python_version<"3"
 rstcheck==3.5.0;python_version<"3"
 Sphinx==1.8.6;python_version<"3"