Bump werkzeug from 0.12.2 to 0.15.3 in /099

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.12.2 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@0.12.2...0.15.3)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

099/requirements.txt

@@ -3,4 +3,4 @@ Flask==0.12.2
 itsdangerous==0.24
 Jinja2==2.9.6
 MarkupSafe==1.0
-Werkzeug==0.12.2
+Werkzeug==0.15.3