Version 1.4.1 - 2019-10-18
    * Handle LexisNexis giving an error 'document' instead of an article
      or omitting copyright field (thanks to Tom Nicholls).

Version 1.4.0 - 2018-06-05
    * Rework parsing code to make it more robust to variations in HTML format.

Version 1.3.1 - 2017-06-30
    * Fix date parsing on Mac (thanks to Simon Naitram for signalling this).

Version 1.3 - 2016-06-29
    * Support more variants of the format (though many likely remain unsupported).

Version 1.2 - 2015-02-22
    * Support importation of English HTML files (thanks to Oriol Mirosa for sending an example file).

Version 1.1 - 2014-05-31
    * Adapt to tm 0.6.
    * Change all tags to lowercase (for consistency with tm).

Version 1.0 - 2014-02-10
    * Initial release with support for HTML files
      saved in French only.