Bump javamelody version to 1.54

This version provides some fixes: [1].

[1] https://code.google.com/p/javamelody/wiki/ReleaseNotes

Change-Id: I4a1f475d19ffb072c536968136e0fceab0e7fd35
diff --git a/lib/BUCK b/lib/BUCK
index 023e81a..9e83e0a 100644
--- a/lib/BUCK
+++ b/lib/BUCK
@@ -2,8 +2,8 @@
 
 maven_jar(
   name = 'javamelody',
-  id = 'net.bull.javamelody:javamelody-core:1.53.0',
-  sha1 = 'c3692ae48f9a363baac3bc52ab0a9ed55c2662c5',
+  id = 'net.bull.javamelody:javamelody-core:1.54.0',
+  sha1 = '609896ea66c008d47258539641f7ba7511a06456',
   license = 'DO_NOT_DISTRIBUTE',
 )