build(deps): bump bleach from 3.1.2 to 3.1.4 in /requirements

Bumps [bleach](https://github.com/mozilla/bleach) from 3.1.2 to 3.1.4.
- [Release notes](https://github.com/mozilla/bleach/releases)
- [Changelog](https://github.com/mozilla/bleach/blob/master/CHANGES)
- [Commits](mozilla/bleach@v3.1.2...v3.1.4)

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

requirements/tests.txt

@@ -6,7 +6,7 @@
 #
 atomicwrites==1.3.0       # via pytest
 attrs==19.3.0             # via pytest
-bleach==3.1.2             # via readme-renderer
+bleach==3.1.4             # via readme-renderer
 docutils==0.16            # via readme-renderer
 more-itertools==5.0.0     # via -r tests.in, pytest
 packaging==20.3           # via pytest

requirements/travis.txt

@@ -8,7 +8,7 @@ apipkg==1.5               # via execnet
 appdirs==1.4.3            # via devpi-server, virtualenv
 argon2-cffi==19.2.0       # via passlib
 attrs==19.3.0             # via devpi-server
-bleach==3.1.2             # via readme-renderer
+bleach==3.1.4             # via readme-renderer
 certifi==2019.11.28       # via requests
 cffi==1.14.0              # via argon2-cffi, cryptography
 chardet==3.0.4            # via requests