[gtksourceview] css: add box-shadow to known properties

[Christian Hergert <chergert src gnome org>]

commit 6aa5de6c0c90399af1ba84f2e0d2d7ec0f6d2df9
Author: Christian Hergert <christian hergert me>
Date:   Mon Sep 14 16:48:59 2015 -0700

    css: add box-shadow to known properties

 data/language-specs/css.lang |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/language-specs/css.lang b/data/language-specs/css.lang
index a94a71b..0b790bf 100644
--- a/data/language-specs/css.lang
+++ b/data/language-specs/css.lang
@@ -212,6 +212,7 @@
       <keyword>border-width</keyword>
       <keyword>border</keyword>
       <keyword>bottom</keyword>
+      <keyword>box-shadow</keyword>
       <keyword>caption-side</keyword>
       <keyword>clear</keyword>
       <keyword>clip</keyword>