[gimp-ruby] gimp-ruby.doap: add myself as maintainer so I can configure gitlab

[Michael Natterer <mitch src gnome org>]

commit d1364fb165d2d2943a3b716ac1a6abc29c61ce8a
Author: Michael Natterer <mitch gimp org>
Date:   Mon Jul 1 18:13:03 2019 +0200

    gimp-ruby.doap: add myself as maintainer so I can configure gitlab

 gimp-ruby.doap | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/gimp-ruby.doap b/gimp-ruby.doap
index 54ec80e..197026c 100644
--- a/gimp-ruby.doap
+++ b/gimp-ruby.doap
@@ -21,4 +21,11 @@
       <gnome:userid>kcozens</gnome:userid>
     </foaf:Person>
   </maintainer>
+
+  <maintainer>
+    <foaf:Person>
+      <foaf:name>Michael Natterer</foaf:name>
+      <gnome:userid>mitch</gnome:userid>
+    </foaf:Person>
+  </maintainer>
 </Project>