forgot the import statement and add 1.3.7 to versions

data/tools/wmllint

@@ -36,6 +36,7 @@
 
 import sys, os, re, getopt, string, copy, difflib, time
 from wesnoth.wmltools import *
+from wesnoth.wmliterator import *
 
 filemoves = {
     # Older includes all previous to 1.3.1.
@@ -253,6 +254,7 @@ filemoves = {
     "1.3.6" : (
 	("Soul Shooter", "Banebow"),
     ),
+    "1.3.7" : (),
     # An empty sentinel value at end is required.
     "trunk" : (),
 }