Update webkit2gtk-4.0 bindings to 2.28.1 in vala 0.40.x
Ubuntu Bionic has the latest Webkit2Gtk and most distributions should also have the latest version given that there is no security fixes to previous versions so It should probably be safe to shit the latest Webkit2Gtk bindings with next Vala 0.40 release
Edited by Rico Tzschichholz