Fix the loading of playerskins DB on Windows

Windows does not load the file with utf8 encoding by default, so I had
to specify it.

lokrez/__init__.py

@@ -200,7 +200,7 @@ def main():
         # Initialize PLAYERSKINS db
         log.debug("loading playerskins db from '{}'" \
                 .format(args.playerskinsdb))
-        with args.playerskinsdb.open("r") as f:
+        with args.playerskinsdb.open("r", encoding="utf8") as f:
             smashgg.PLAYERSKINS = json.load(f)
 
         #