Bump bleach from 3.1.0 to 3.1.4 (#49)

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)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -4,7 +4,7 @@ Pygments==2.3.1
 Send2Trash==1.5.0
 attrs==19.1.0
 backcall==0.1.0
-bleach==3.1.0
+bleach==3.1.4
 colorama==0.4.1
 decorator==4.3.2
 defusedxml==0.5.0