+What's new in Redis 2.2.2
+Redis 2.2.2 is a bugfix release. Changelog:
+* AOF file descriptor leak after the first rewrite fixed.
+* Return value of GETRANGE / SUBSTR is now an empty string if the interval
+ specified is not valid, or the key does not exist. Was a null bulk reply
+ before, but this is against the Redis way.
What's new in Redis 2.2.1