changed runtime environment to 1.5
diff --git a/bundles/org.eclipse.rap.rwt.visualization.google/META-INF/MANIFEST.MF b/bundles/org.eclipse.rap.rwt.visualization.google/META-INF/MANIFEST.MF
index 8a5a4f7..a20a6ca 100644
--- a/bundles/org.eclipse.rap.rwt.visualization.google/META-INF/MANIFEST.MF
+++ b/bundles/org.eclipse.rap.rwt.visualization.google/META-INF/MANIFEST.MF
@@ -12,4 +12,4 @@
  org.eclipse.rap.rwt.visualization.google,
  org.eclipse.rap.rwt.visualization.google.json
 Bundle-Vendor: %Bundle-Vendor
-Bundle-RequiredExecutionEnvironment: J2SE-1.4
+Bundle-RequiredExecutionEnvironment: J2SE-1.5