[gtksourceview] xml.lang: add support for sgml file type

[Sébastien Wilmet <swilmet src gnome org>]

commit 916b242693964e6bb1b19b47e70dbe338d70f0a1
Author: Pavlo Solntsev <p sun fun gmail com>
Date:   Tue May 1 14:00:30 2018 -0500

    xml.lang: add support for sgml file type
    
    File type sgml will be treated as xml file.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=795733

 data/language-specs/xml.lang |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/data/language-specs/xml.lang b/data/language-specs/xml.lang
index 8fd7d3e..6303e19 100644
--- a/data/language-specs/xml.lang
+++ b/data/language-specs/xml.lang
@@ -24,8 +24,8 @@
 -->
 <language id="xml" name="XML" version="2.0" _section="Markup">
     <metadata>
-        <property name="mimetypes">application/xml;text/xml</property>
-        <property 
name="globs">*.xml;*.xspf;*.siv;*.smil;*.smi;*.sml;*.kino;*.xul;*.xbel;*.abw;*.zabw;*.glade;*.jnlp;*.xhtml;*.svg;*.mml;*.rdf;*.rss;*.wml;*.xmi;*.fo;*.xslfo</property>
+        <property name="mimetypes">application/xml;text/xml;text/sgml</property>
+        <property 
name="globs">*.xml;*.xspf;*.siv;*.smil;*.smi;*.sml;*.kino;*.xul;*.xbel;*.abw;*.zabw;*.glade;*.jnlp;*.xhtml;*.svg;*.mml;*.rdf;*.rss;*.wml;*.xmi;*.fo;*.xslfo;*.sgml</property>
         <property name="block-comment-start">&lt;!--</property>
         <property name="block-comment-end">--&gt;</property>
     </metadata>