Bump werkzeug in /{{cookiecutter.app_name}}/requirements

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.15.6 to 0.16.0.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/werkzeug/compare/0.15.6...0.16.0)

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

{{cookiecutter.app_name}}/requirements/prod.txt

@@ -2,7 +2,7 @@
 
 # Flask
 Flask==1.1.1
-Werkzeug==0.15.6
+Werkzeug==0.16.0
 click>=7.0
 
 # Database