Document new --idl-version and macro

[jwillemsen]

For RemedyIT/ridl#106

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (df7e482) 59.65% compared to head (51f46d5) 59.65%.

❗ Current head 51f46d5 differs from pull request most recent head 39658ac. Consider uploading reports for the commit 39658ac to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #283   +/-   ##
=======================================
  Coverage   59.65%   59.65%           
=======================================
  Files         573      573           
  Lines       47517    47517           
  Branches     4197     4197           
=======================================
  Hits        28345    28345           
  Misses      16086    16086           
  Partials     3086     3086           

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