[gnome-software] (6 commits) ...Merge branch '155-allow-some-markup-in-release-notes-in-appdata' into 'main'

[Philip Withnall <pwithnall src gnome org>]

Summary of changes:

  388c8d2... gs-appstream: Support more markup in the description text (*)
  f21fc3e... GsApp: Store update-details as markup (*)
  2ba7d33... packagekit: Generate pango markup for the app description (*)
  13b9e27... gs-description-box: Use markup for the description text (*)
  230f0ab... gs-app-version-history-row: Use markup for the version hist (*)
  f7b1c3c... Merge branch '155-allow-some-markup-in-release-notes-in-app

(*) This commit already existed in another branch; no separate mail sent