[gtksourceview] groovy.lang: add mimetype for groovy

[Christian Hergert <chergert src gnome org>]

commit c917bcb895dae2245bb6a265f5f1ba2c6294819d
Author: Brennon Miller <brennon digitaldiplomat net>
Date:   Fri May 17 00:17:51 2019 +0000

    groovy.lang: add mimetype for groovy

 data/language-specs/groovy.lang | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/data/language-specs/groovy.lang b/data/language-specs/groovy.lang
index 7542ca6c..fc7f8310 100644
--- a/data/language-specs/groovy.lang
+++ b/data/language-specs/groovy.lang
@@ -23,6 +23,7 @@
 -->
 <language id="groovy" name="Groovy" version="2.0" _section="Source">
   <metadata>
+    <property name="mimetypes">text/x-groovy</property>
     <property name="globs">*.groovy</property>
     <property name="line-comment-start">//</property>
     <property name="block-comment-start">/*</property>