- fix readme with added 2.2.3 support

Author: Daniel Leong

README.md

@@ -8,7 +8,7 @@ CachedResource is a Ruby gem whose goal is to increase the performance of intera
 CachedResource supports the following Ruby versions:
 
 * 1.9.2, 1.9.3
-* 2.0.0, 2.1.0
+* 2.0.0, 2.1.0, 2.2.3
 
 If you require 1.8.7 support, please use version 2.3.4.
 
@@ -36,7 +36,7 @@ CachedResource accepts the following options:
 
 * `:enabled` Default: `true`
 * `:ttl` The time in seconds until the cache should expire. Default: `604800`
-* `:race_condition_ttl` The race condition ttl, to prevent `dog pile effect(https://en.wikipedia.org/wiki/Cache_stampede)` or `cache stampede(https://en.wikipedia.org/wiki/Cache_stampede)`. Default: 86400
+* `:race_condition_ttl` The race condition ttl, to prevent [dog pile effect](https://en.wikipedia.org/wiki/Cache_stampede) or [cache stampede](https://en.wikipedia.org/wiki/Cache_stampede). Default: 86400
 * `:ttl_randomization` Enable ttl randomization. Default: `false`
 * `:ttl_randomization_scale` A Range from which a random value will be selected to scale the ttl. Default: `1..2`
 * `:collection_synchronize` Use collections to generate cache entries for individuals.  Update the existing cached principal collection when retrieving subsets of the principal collection or individuals.  Default: `false`