build(deps): bump werkzeug in /netzob_web/requirements

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.11.15 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@0.11.15...0.15.3)

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

netzob_web/requirements/prod.txt

@@ -3,7 +3,7 @@
 # Flask
 Flask==0.12
 MarkupSafe==1.0
-Werkzeug==0.11.15
+Werkzeug==0.15.3
 Jinja2==2.9.5
 itsdangerous==0.24
 click>=5.0