Bump bleach from 3.1.0 to 3.1.4 in /pip (#222)

Bumps [bleach](https://github.com/mozilla/bleach) from 3.1.0 to 3.1.4.
- [Release notes](https://github.com/mozilla/bleach/releases)
- [Changelog](https://github.com/mozilla/bleach/blob/master/CHANGES)
- [Commits](mozilla/bleach@v3.1.0...v3.1.4)

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pip/requirements.txt

@@ -1,5 +1,5 @@
 Pygments==2.3.1
-bleach==3.1.0
+bleach==3.1.4
 certifi==2018.11.29
 chardet==3.0.4
 docutils==0.14