ADD DATABASES env var in the readme file #102 (#173)

Author: keroloswilliam

README.markdown

@@ -56,6 +56,7 @@ Environment variables summary
 * ``REDIS_1_NAME`` - define name of the Redis server
 * ``REDIS_1_PORT`` - define port of the Redis server
 * ``REDIS_1_AUTH`` - define password of the Redis server
+* ``REDIS_1_DATABASES`` - You can modify you config to prevent phpRedisAdmin from using CONFIG command 
 * ``ADMIN_USER`` - define username for user-facing Basic Auth
 * ``ADMIN_PASS`` - define password for user-facing Basic Auth