Version 0.7.0 - 2020-04-01
    * Update Snowball library to version 2.0. This adds support
      for Arabic, Basque, Catalan, Greek, Hindi, Indonesian, Irish,
      Lithuanian, Nepali and Tamil.

Version 0.6.0 - 2019-01-07
    * Fix wordStem(NA) to return NA instead of "NA".

Version 0.5.1 - 2014-08-08
    * Clarify license.

Version 0.5 - 2013-05-22
    * Initial release.
