build(deps-dev): bump bleach from 3.1.4 to 3.1.5

Bumps [bleach](https://github.com/mozilla/bleach) from 3.1.4 to 3.1.5.
- [Release notes](https://github.com/mozilla/bleach/releases)
- [Changelog](https://github.com/mozilla/bleach/blob/master/CHANGES)
- [Commits](mozilla/bleach@v3.1.4...v3.1.5)

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

requirements/dev.txt

@@ -9,7 +9,7 @@ arrow==0.15.5             # via jinja2-time
 attrs==19.3.0             # via nicfit.py
 babel==2.8.0              # via sphinx
 binaryornot==0.4.4        # via cookiecutter
-bleach==3.1.4             # via readme-renderer
+bleach==3.1.5             # via readme-renderer
 certifi==2020.4.5.1       # via requests
 cffi==1.14.0              # via cryptography
 chardet==3.0.4            # via binaryornot, requests