Add reference to directory-1.15.xml

Change-Id: I764b1a1daae36f29d97afd9c95a3fd49d69007a7
Signed-off-by: Fred Bricon <fbricon@gmail.com>
diff --git a/org.eclipse.m2e.discovery/src/org/eclipse/m2e/internal/discovery/MavenDiscovery.java b/org.eclipse.m2e.discovery/src/org/eclipse/m2e/internal/discovery/MavenDiscovery.java
index 64fc7e5..38c13ed 100644
--- a/org.eclipse.m2e.discovery/src/org/eclipse/m2e/internal/discovery/MavenDiscovery.java
+++ b/org.eclipse.m2e.discovery/src/org/eclipse/m2e/internal/discovery/MavenDiscovery.java
@@ -66,7 +66,7 @@
 
   private static final String DEFAULT_BASEURL = "http://download.eclipse.org/technology/m2e/discovery/"; //$NON-NLS-1$
 
-  private static final String DEFAULT_FILENAME = "directory-1.14.xml"; //$NON-NLS-1$
+  private static final String DEFAULT_FILENAME = "directory-1.15.xml"; //$NON-NLS-1$
 
   public static final String DEFAULT_URL = DEFAULT_BASEURL + DEFAULT_FILENAME;