Bump bleach from 3.1.0 to 3.1.1

Bumps [bleach](https://github.com/mozilla/bleach) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/mozilla/bleach/releases)
- [Changelog](https://github.com/mozilla/bleach/blob/master/CHANGES)
- [Commits](mozilla/bleach@v3.1.0...v3.1.1)

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

requirements.txt

@@ -1,7 +1,7 @@
 pyyaml==5.1
 jsonschema==3.0.1
 hashids==1.2.0
-bleach==3.1.0
+bleach==3.1.1
 rfc3987==1.3.8
 jinja2==2.10.1
 pillow==6.2.0