2.91.5:
* Replaced Glib::*Handles with std::vector. (Krzesimir Nowak)

2.91.4:
* Fixed build with recent GtkSourceView. (Krzesimir Nowak, Murray Cumming)
* Wrapped missing properties in SourceGutterRendererPixbuf,
  SourceGutterRendererText, SourceLanguage, SourceLanguageManager,
  SourceStyleScheme, SourceStyleSchemeManager. (Krzesimir Nowak)

2.91.3:
* There was no 2.91.3. Sorry.