Log Message:
meld: update to 3.20.0.

2019-01-06 meld 3.20.0
======================

  Fixes:

   * Add Enter as a Compare accelerator in folder comparisons (Kai Willadsen)
   * Change entry and drag-n-drop file changes to confirm discarding modified
     files instead of offering to save, for simplicity (Kai Willadsen)
   * Fix menu sensitivity in folder comparisons (Kai Willadsen)
   * Avoid dconf writes of no-op window size allocations (Kai Willadsen)

   * Issues fixed: 247, 262

  Translations:

   * Emin Tufan Çetin (tr)
   * Milo Casagrande (it)
   * Rafael Fontenelle (pt_BR)