sync contributors.xml

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@436935 13f79535-47bb-0310-9956-ffa450edef68

contributors.xml

@@ -590,6 +590,10 @@
     <first>Martin</first>
     <last>van den Bemt</last>
   </name>
+  <name>
+    <first>Mathieu</first>
+    <last>Champlon</last>
+  </name>
   <name>
     <first>Mathieu</first>
     <last>Peltier</last>