Add -generated-notice, as suggested by #99Add -generated-file-notice, as suggested by #99

[alexandregv]

As suggested by #99, this PR adds a new flag allowing to add a "Generated file" notice in the raw README, via a HTML comment.
This makes the comment invisible in rendered Markdown, but visible when editing the raw file.

CLI flag is -generated-notice and JSON field is generated_notice.
Default value is false (compatible with current behavior).

I feel like this one could be true by default. If true by default, I'm not sure how to implement it with the JSON config, or if I should change it to something like skip-generated-notice?

Any opinion/idea is welcome.

Test has been added too.

Closes #99

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.87%. Comparing base (8283e66) to head (03a0d61).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #132   +/-   ##
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  Coverage   69.87%   69.87%           
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  Files           3        3           
  Lines          83       83           
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  Hits           58       58           
  Misses         15       15           
  Partials       10       10           

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