Update Javamelody project URL

Javamelody has moved from Google Code to GitHub.

Change-Id: I8bbd357144a4eceefb9126170937c32937b548d8
diff --git a/src/main/resources/Documentation/about.md b/src/main/resources/Documentation/about.md
index f7326e9..f45afd3 100644
--- a/src/main/resources/Documentation/about.md
+++ b/src/main/resources/Documentation/about.md
@@ -1,6 +1,6 @@
 This plugin allows to monitor the Gerrit server.
 
-This plugin integrates [JavaMelody](https://code.google.com/p/javamelody) in
+This plugin integrates [JavaMelody](https://github.com/javamelody/javamelody) in
 Gerrit in order to retrieve live instrumentation data from Gerrit.
 
 To access the monitoring URL a user must be a member of a group that is