Reformat `gecco.cli` source code with `black`

3 jobs for refactor in 2 minutes and 49 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
passed test:python3.7 #37002

00:02:08

63.0%
 
  Pages
passed docs #37003

00:00:26

 
  Lint
passed lint:pydocstyle #37004

00:00:15