Bump werkzeug from 0.15.5 to 0.15.6 in /{{cookiecutter.app_name}} (#545)

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.15.5 to 0.15.6.
- [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/0.15.5...0.15.6)

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

{{cookiecutter.app_name}}/Pipfile

@@ -6,7 +6,7 @@ name = "pypi"
 [packages]
 # Flask
 Flask = "==1.1.1"
-Werkzeug = "==0.15.5"
+Werkzeug = "==0.15.6"
 click = ">=5.0"
 
 # Database