-D hello=world is added.

[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.

resolves #256

[codecov-io]

Codecov Report

Merging #324 into dev will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev     #324      +/-   ##
==========================================
+ Coverage   95.35%   95.39%   +0.04%     
==========================================
  Files          50       51       +1     
  Lines        2517     2542      +25     
==========================================
+ Hits         2400     2425      +25     
  Misses        117      117

Impacted Files	Coverage Δ
tests/test_docs.py	100% <100%> (ø)	⬆️
moban/core/context.py	100% <100%> (ø)	⬆️
moban/program_options.py	100% <100%> (ø)
moban/main.py	100% <100%> (ø)	⬆️
moban/constants.py	100% <100%> (ø)	⬆️

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[chfw]

Please note: -D was renamed to use -d in version 0.6.0

-D never entered in use.