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]

requirements.txt

@@ -64,6 +64,6 @@ tqdm==4.29.0
 traitlets==4.3.3
 wcwidth==0.2.5
 webencodings==0.5.1
-Werkzeug==0.14.1
+Werkzeug==0.15.3
 wincertstore==0.2
 zipp==3.1.0