Bump werkzeug from 0.15.1 to 0.15.3

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.15.1 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@0.15.1...0.15.3)

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

Author: dependabot[bot]

requirements.txt

@@ -44,4 +44,4 @@ termcolor==1.1.0
 tqdm==4.31.1
 typing==3.6.6
 wavio==0.0.4
-Werkzeug==0.15.1
+Werkzeug==0.15.3