Update doap file with programming language

Author: kaiw

meld.doap

@@ -18,6 +18,7 @@
   <bug-database rdf:resource="http://bugzilla.gnome.org/browse.cgi?product=meld" />
 
   <category rdf:resource="http://api.gnome.org/doap-extensions#development" />
+  <programming-language>Python</programming-language>
 
   <maintainer>
     <foaf:Person>