Replace twig with couch_log
diff --git a/src/mem3_rep.erl b/src/mem3_rep.erl
index 339bd66..1213884 100644
--- a/src/mem3_rep.erl
+++ b/src/mem3_rep.erl
@@ -336,7 +336,7 @@
         {ok, _, not_found} ->
             {not_found, missing};
         Else ->
-            twig:log(err, "Error finding replication doc: ~w", [Else]),
+            couch_log:error("Error finding replication doc: ~w", [Else]),
             {not_found, missing}
     end.