Here is the documentation of older releases:

  • 4.4 – current
  • 4.3 – released June 8, 2018
  • 4.2 – released July 28, 2017
  • 4.1 – released April 26, 2017
  • 4.0 – released January 20, 2017
  • 3.2 – released August 4, 2016
  • 3.1 – released April 5, 2016
  • 3.0 – released January 30, 2016
  • 2.4 – released May 20, 2015