News in 3.29.3, 2018-06-17
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* Devhelp has moved to the GNOME GitLab instance. The bugzilla tickets have not
  yet been migrated to the GitLab issues, so before filing a new issue on
  GitLab, please search the bugzilla first. All links are available as usual
  on:
  https://wiki.gnome.org/Apps/Devhelp

* Finally write a HACKING file.
* Do not show a GtkInfoBar on error, use the WebKitWebView default
  implementation to simplify the code.
* Code refactorings: from DhWindow extract DhNotebook, DhSearchBar and
  bind_sidebar_and_notebook() function, and delegate more work to DhWebView.
* Make the following classes re-usable and move them to the libdevhelp:
  DhWebView, DhTab, DhTabLabel, DhNotebook and DhSearchBar.
  And move dh_window_bind_sidebar_and_notebook() to the libdevhelp.
* Flatpak: run Amtk and Devhelp unit tests after building those modules.
* Application icons: rename filenames to org.gnome.Devhelp.*, to simplify the
  Flatpak manifest.
* Build system: fix the remaining places where the libdevhelp API/major version
  was hardcoded, use the variable instead, to easily bump it in the future.
* Other small improvements.
* Translation updates.