Version 2.1.0 (2020-02-13)
  Added new `linkchecker_preprocess` function to allow links to be adjusted before link checking #LIN-3
Version 2.0.3 (2019-06-07)
  Fixed link checking being performed incorrectly on empty links #TINY-3654
Version 2.0.2 (2019-04-29)
  Changed error messages to display in the console instead of the UI #TINY-3593
  Fixed repeating context menu items #TINY-3543
  Improved screen reader accessibility and added "ignore invalid link" status #TINY-2329
  Marked local links as unknown instead of invalid.
Version 1.1.1 (2018-05-16)
  Fixed bug where the link context menu wasn't working #TINY-1680.
Version 1.1.0 (2018-02-01)
  Decreased plugin size by improving build steps.
Version 1.0.5 (2017-12-08)
  Fixed issue where it would use a direct reference to the menu control instead of using the ui factory.
Version 1.0.4 (2017-06-13)
  Fixed so that the error messages are more human readable. #TINY-1077
Version 1.0.3 (2017-05-04)
  Fixed bug where anchor links were highlighted as invalid, they are now ignored by the checker. #TINY-997
Version 1.0.2 (2017-04-03)
  Added inline tooltip to show more info when a link does not seem to be valid. #TINY-944
Version 1.0.1 (2017-03-01)
  Fixed web url normalization. #TINY-922
Version 1.0.0 (2017-01-11)
  Initial release.