Bump werkzeug from 0.10.4 to 0.15.3

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.10.4 to 0.15.3.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/master/CHANGES.rst)
- [Commits](pallets/werkzeug@0.10.4...0.15.3)

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

Author: dependabot[bot]

requirements.txt

@@ -34,7 +34,7 @@ WTForms-Alchemy==0.13.3
 WTForms-Components==0.9.7
 Wand==0.6.3
 WebHelpers==1.3
-Werkzeug==0.10.4
+Werkzeug==0.15.3
 XlsxWriter==0.5.3
 alembic==0.7.5.post2
 amqp==1.4.6