Release 4.2.8

[Comments]

2020/04/16: Free, Premium, WPf2b

  • Add link to new support forum.
  • Fix user enumeration conflict with Gutenberg h/t @dinghy.
  • Fix notices wrt admin menu h/t @marioivangf.
  • Fix harmless XDebug notice h/t @dinghy.
  • Update Freemius library.