Bump click from 6.7 to 7.0

Bumps [click](https://github.com/pallets/click) from 6.7 to 7.0.
- [Release notes](https://github.com/pallets/click/releases)
- [Changelog](https://github.com/pallets/click/blob/master/CHANGES.rst)
- [Commits](pallets/click@6.7...7.0)

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

requirements.txt

@@ -1,6 +1,6 @@
 Jinja2==2.10.1
 Werkzeug==0.14.1
-click==6.7
+click==7.0
 gevent-websocket==0.10.1
 gevent==1.3.6
 watchdog==0.8.3