Update documentation for master / slave replication.

CHANGELOG.md

@@ -3,6 +3,11 @@ v0.7.1 (201x-xx-xx)
 
 - Miscellaneous minor fixes.
 
+- Added transparent support for master / slave replication configurations where
+  write operations are performed on the master server and read operations are
+  routed to one of the slaves. Please refer to ISSUE #21 for a bit of history
+  and more details about replication support in Predis.
+
 - The 'profile' client option now accepts a callable object used to initialize
   a new instance of Predis\Profiles\IServerProfile.
 

README.md

@@ -13,6 +13,7 @@ project,
 - Complete support for Redis from __1.2__ to __2.4__ and the current development versions using different
   server profiles.
 - Client-side sharding with support for consistent hashing or custom distribution strategies.
+- Support for master / slave replication configurations (write on master, read from slaves).
 - Command pipelining on single and aggregated connections.
 - Transparent key prefixing strategy capable of handling any command known that has keys in its arguments.
 - Abstraction for Redis transactions (Redis >= 2.0) with support for CAS operations (Redis >= 2.2).