add option for graphmod to support both hg 2.2 and hg 2.1

rhodecode/controllers/changelog.py

@@ -126,7 +126,12 class ChangelogController(BaseRepoContro
 
         elif repo.alias == 'hg':
             dag = graphmod.dagwalker(repo._repo, revs)
-            c.dag = graphmod.colored(dag, repo._repo)
+            try:
+                c.dag = graphmod.colored(dag)
+            except:
+                #HG 2.2+
+                c.dag = graphmod.colored(dag, repo._repo)
+
             for (id, type, ctx, vtx, edges) in c.dag:
                 if type != graphmod.CHANGESET:
                     continue