Bump werkzeug from 0.14.1 to 0.15.3

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.14.1 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@0.14.1...0.15.3)

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

Author: dependabot[bot]

setup.py

@@ -76,7 +76,7 @@ def run_tests(self):
     'redis==2.10.6',
     'sqlparse==0.2.2',
     'timeside>=0.7',
-    'Werkzeug==0.14.1',
+    'Werkzeug==0.15.3',
     'zipstream==1.1.4',
     ],
   tests_require=['pytest-django', 'pytest-cov', 'factory-boy'],