Log Message:
meld: update to 3.20.1.

2019-03-31 meld 3.20.1
======================

  Fixes:

   * Fix bad comparison highlighting with VT characters (Kai Willadsen)
   * Fix folder comparison display with >2G files (Kai Willadsen)
   * Fix support for missing folders in folder comparison (Kai Willadsen)
   * Handle trash-related errors with NFS mounts (Kai Willadsen)
   * Add release metadata to appstream data (Kai Willadsen)

   * Issues fixed: 268, 295

  Translations:

   * Anders Jonsson (sv)
   * Balázs Úr (hu)
   * Daniel Mustieles (es)
   * Marek Cernocky (cs)
   * Ryuta Fujii (ja)
   * Wolfgang Stöggl (de)