Bug 1154796 - bump mozharness.json to match 239491bc393a, CLOSED TREE r=ryanvm a=testing

--HG--
extra : amend_source : d599fae2ccb0b8599e41d8d37ecfbf49a585a4de

testing/mozharness/mozharness.json

@@ -1,4 +1,4 @@
 {
     "repo": "https://hg.mozilla.org/build/mozharness",
-    "revision": "94d72bb2ba9b"
+    "revision": "239491bc393a"
 }