[MSHARED-399] Upgrade to Maven 2.2.1 compatiblity

git-svn-id: https://svn.apache.org/repos/asf/maven/shared/trunk@1653089 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index bef27b5..7d2d41d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -43,7 +43,7 @@
   </contributors>
 
   <prerequisites>
-    <maven>2.0.6</maven>
+    <maven>2.2.1</maven>
   </prerequisites>
 
   <scm>