Update readme

README.md

@@ -5,11 +5,6 @@ Generic connection pooling for Ruby.
 
 MongoDB has its own connection pool.  ActiveRecord has its own connection pool.  This is a generic connection pool that can be used with anything, e.g. Redis, Dalli and other Ruby network clients.
 
-Requirements
---------------
-
-connection_pool requires Ruby 1.9 because it uses BasicObject.
-
 
 Install
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@@ -29,6 +24,25 @@ Then use the pool in your application:
       dalli.get('some-count')
     end
 
+You can use `ConnectionPool::Wrapper` to wrap a single global connection, making
+it easier to port your connection code over time:
+
+    $redis = ConnectionPool::Wrapper.new(:size => 5, :timeout => 3) { Redis.connect }
+    $redis.sadd('foo', 1)
+    $redis.smembers('foo')
+
+The Wrapper uses `method_missing` to checkout a connection, run the
+requested method and then immediately check the connection back into the
+pool.  It's **not** high-performance so you'll want to port your
+performance sensitive code to use `with_connection` as soon as possible.
+
+    $redis.with_connection do |conn|
+      conn.sadd('foo', 1)
+      conn.smembers('foo')
+    end
+
+Once you've ported your entire system to use `with`, you can simply
+remove ::Wrapper and use a simple, fast ConnectionPool.
 
 Author
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