update readme

Author: Prototype-X

README.md

@@ -217,5 +217,7 @@ If you need convert from old style config to YAML format, use **converter.py**
     user@pc:~$ ls /path-to-old-style-cfg
     map.cfg
     map.yaml
+
+For a better look of map, set the link type a dot and color like background.
 
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