Bump invoke from 1.2.0 to 1.3.0

Bumps [invoke](https://github.com/bitprophet/alabaster) from 1.2.0 to 1.3.0.
- [Release notes](https://github.com/bitprophet/alabaster/releases)
- [Changelog](https://github.com/bitprophet/alabaster/blob/master/docs/changelog.rst)
- [Commits](https://github.com/bitprophet/alabaster/commits)

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

requirements.txt

@@ -118,7 +118,7 @@ uWSGI==2.0.18
 gunicorn==19.9.0
 ipython==5.8.0
 docker==4.0.2
-invoke==1.2.0
+invoke==1.3.0
 
 # tests
 coverage==4.5.4