Announce: Flatpak 1.4.2

[Alexander Larsson]

Available at:
  https://github.com/flatpak/flatpak/releases/tag/1.4.2

$ sha256sum flatpak-1.4.2.tar.xz
f2799a6d973a052529b52943021108f148706d3e69725ac7dd60bf6ac4bdd522
flatpak-1.4.2.tar.xz

Changes in 1.4.2
================

 * Support extra_data in extensions.
 * Handle double slashes ("//")in XDG_DATA_DIRS.
 * Fix detection of local related refs.

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 Alexander Larsson                                Red Hat, Inc
       alexl at redhat.com         alexander.larsson at gmail.com