Bump werkzeug from 0.14.1 to 0.15.2 in /{{cookiecutter.app_name}} (#451)

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.14.1 to 0.15.2.
- [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/0.14.1...0.15.2)

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

{{cookiecutter.app_name}}/Pipfile

@@ -7,7 +7,7 @@ name = "pypi"
 # Flask
 Flask = "==1.0.2"
 MarkupSafe = "==1.1.1"
-Werkzeug = "==0.14.1"
+Werkzeug = "==0.15.2"
 Jinja2 = "==2.10.1"
 itsdangerous = "==1.1.0"
 click = ">=5.0"