make connection pool reference clickable

Author: espen

README.md

@@ -77,7 +77,7 @@ The client does not provide connection pooling. Each `Redis` instance
 has one and only one connection to the server, and use of this connection
 is protected by a mutex.
 
-As such it is heavilly recommended to use the [`connection_pool` gem], e.g.:
+As such it is heavilly recommended to use the [`connection_pool` gem](https://github.com/mperham/connection_pool), e.g.:
 
 ```ruby
 module MyApp
@@ -91,8 +91,6 @@ end
 MyApp.redis.incr("some-counter")
 ```
 
-[`connection_pool` gem](https://github.com/mperham/connection_pool)
-
 ## Sentinel support
 
 The client is able to perform automatic failover by using [Redis