getopt 1.19.1
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* If a passed in option matches multiple options in the getopt specification but matches one exactly
  then `getopt` now uses that value instead of throwing a "long flag is ambiguous" error.

getopt 1.19.0
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* Exports new function `get_Rscript_filename` that returns name of calling script,
  `getopt` now uses this function value as default for `command` argument
* Documentation improved and now highlights differences 
  between `getopt` and `optparse` packages for new undecided users