Merge pull request #21 from CircleCI-Public/dependabot/pip/requirements/bleach-3.1.1

Bump bleach from 2.0.0 to 3.1.1 in /requirements

Author: Michael Thanh

requirements/common.txt

@@ -18,7 +18,7 @@ SQLAlchemy==1.3.0
 WTForms==2.1
 Werkzeug==0.15.4
 alembic==0.9.5
-bleach==2.0.0
+bleach==3.1.1
 blinker==1.4
 html5lib==1.0b10
 itsdangerous==0.24