no verbose for error, -v for warning, -vv for warning+info, -vvv for warning+info+debug

[chfw]

Before raising the PR, here is a check list:

• have you written unit tests for your code changes?
• have you updated the change log?
• can someone else understand your changes without your explanation?
• are you proud of your code changes?
• please add your name and github link to contributors.rst in alphabetical order.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (dev@72330ee). Click here to learn what that means.
The diff coverage is 100%.

@@          Coverage Diff           @@
##             dev     #350   +/-   ##
======================================
  Coverage       ?   96.29%           
======================================
  Files          ?       55           
  Lines          ?     2804           
  Branches       ?        0           
======================================
  Hits           ?     2700           
  Misses         ?      104           
  Partials       ?        0

Impacted Files	Coverage Δ
moban/externals/reporter.py	95.91% <ø> (ø)
moban/core/context.py	100% <100%> (ø)
moban/_version.py	100% <100%> (ø)
moban/main.py	100% <100%> (ø)
...sts/integration_tests/test_command_line_options.py	99.7% <100%> (ø)

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