[gedit] Try to fix build with new libpeas

[Michael Catanzaro <mcatanzaro src gnome org>]

commit d52b564e4b619ffe069bf8685259fbfc323cc264
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Tue Aug 6 11:15:03 2019 -0500

    Try to fix build with new libpeas
    
    Thanks Christian for this patch. Hopefully fixes #198.

 gedit/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gedit/meson.build b/gedit/meson.build
index 2b46aa462..6e7edfd55 100644
--- a/gedit/meson.build
+++ b/gedit/meson.build
@@ -129,6 +129,7 @@ libgedit_deps = [
   gio_dep,
   gtk_dep,
   gtksourceview_dep,
+  introspection_dep,
   libpeas_dep,
   libpeas_gtk_dep,
   libxml_dep,