Log Message:
gtksourceview4: update to 4.0.2.

News in 4.0.2, 2018-06-17
-------------------------
* GtkSourceView 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/Projects/GtkSourceView

* Fix new compilation warnings (-Wcast-function-type).
* New syntax highlighting definition file for: SCSS and Less.
* Improvements to the syntax highlighting of: CSS and Rust.

News in 4.0.1, 2018-05-05
-------------------------
* New syntax highlighting definition file for: TOML.
* Improvements to the syntax highlighting of: CSS and XML.
* Translation updates.