Bump bleach from 3.1.0 to 3.1.4

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] <support@github.com>

Author: dependabot[bot]

2019-08-06-bob-ross-requirements.txt

@@ -4,7 +4,7 @@ attrs==19.1.0
 backcall==0.1.0
 black==19.3b0
 blackcellmagic==0.0.2
-bleach==3.1.0
+bleach==3.1.4
 Click==7.0
 cycler==0.10.0
 decorator==4.4.0

requirements.txt

@@ -2,7 +2,7 @@ appnope==0.1.0
 atomicwrites==1.3.0
 attrs==19.1.0
 backcall==0.1.0
-bleach==3.1.0
+bleach==3.1.4
 certifi==2019.03.09
 cffi==1.12.2
 chardet==3.0.4