meld: update to 3.20.2.

2020-02-16 meld 3.20.2
======================

  Fixes:

  * Fix crash when launched from external process on Windows (Vasily Galkin)
  * Fix single-instance behaviour on Windows (Vasily Galkin)
  * Fix display of large file sizes (Andrey Efremov)
  * Set file chooser encoding to autodetect by default (Kai Willadsen)
  * Always use UTF-8 as user's "current" encoding on Windows (Kai Willadsen)
  * Fix ignoring blank lines on text-filtered files in folder comparison (Kai
    Willadsen)
  * Fix expand/collapse actions for missing folders (Kai Willadsen)
  * Fix some incorrect action sensitivity settings (Kai Willadsen)
  * Fix height of commit dialog (Kai Willadsen)
  * Fix install support for Python 3.8 (Kai Willadsen)
  * Add support for file debug logging on Windows (Kai Willadsen)
  * Fix icon display on Windows (Kai Willadsen)

  * Issues fixed: 267, 279, 314, 322, 337, 341, 342, 350, 351, 359

(wiz)