minor test rename

Author: Peter

core/src/test/java/com/graphhopper/routing/DijkstraOneToManyTest.java

@@ -98,7 +98,7 @@ public void testIssue182()
     }
 
     @Test
-    public void testIssue182()
+    public void testIssue239()
     {
         Graph g = createGraph(false);
         g.edge(0, 1, 1, true);