[gtksourceview] Update POTFILES.skip

[Piotr Drąg <piotrdrag src gnome org>]

commit c20cbbd98c54b5a28a8c62d90414df2fb97bce89
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Sep 6 01:12:47 2018 +0200

    Update POTFILES.skip

 po/POTFILES.skip | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index efe85f2a..203db548 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -40,6 +40,7 @@ data/language-specs/dtd.lang
 data/language-specs/eiffel.lang
 data/language-specs/erlang.lang
 data/language-specs/fcl.lang
+data/language-specs/fish.lang
 data/language-specs/forth.lang
 data/language-specs/fortran.lang
 data/language-specs/fsharp.lang