[gtksourceview] Update POTFILES.skip

[Piotr Drąg <piotrdrag src gnome org>]

commit deea3fba70a78d931df73e977757fc41bb935ec2
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun Feb 10 18:58:00 2019 +0100

    Update POTFILES.skip

 po/POTFILES.skip | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index fac31266..0281583a 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -1,11 +1,11 @@
 data/styles/testdark.xml
 docs/reference/lang-tutorial.xml
 tests/test-completion.ui
+tests/test-scheme.xml
 tests/test-search.ui
 tests/test-widget.ui
-tests/test-scheme.xml
-data/language-specs/actionscript.lang
 data/language-specs/abnf.lang
+data/language-specs/actionscript.lang
 data/language-specs/ada.lang
 data/language-specs/ansforth94.lang
 data/language-specs/asp.lang
@@ -27,16 +27,17 @@ data/language-specs/csharp.lang
 data/language-specs/css.lang
 data/language-specs/csv.lang
 data/language-specs/cuda.lang
+data/language-specs/dart.lang
 data/language-specs/def.lang
 data/language-specs/desktop.lang
 data/language-specs/diff.lang
-data/language-specs/dtl.lang
 data/language-specs/d.lang
 data/language-specs/docbook.lang
 data/language-specs/dosbatch.lang
 data/language-specs/dot.lang
 data/language-specs/dpatch.lang
 data/language-specs/dtd.lang
+data/language-specs/dtl.lang
 data/language-specs/eiffel.lang
 data/language-specs/erlang.lang
 data/language-specs/fcl.lang