Bump werkzeug from 0.16.1 to 1.0.0

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.16.1 to 1.0.0.
- [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/0.16.1...1.0.0

)

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

requirements-dev.txt

@@ -7,4 +7,4 @@ flake8==3.7.9
 responses==0.10.9
 stellar==0.4.5
 wagtail-factories==2.0.0
-Werkzeug==0.16.1
+Werkzeug==1.0.0