Update readme. Remove reference to node-pool as it is no longer used

Author: brianc

packages/pg-pool/README.md

@@ -25,8 +25,7 @@ const pool = new Pool()
 
 // you can pass properties to the pool
 // these properties are passed unchanged to both the node-postgres Client constructor
-// and the node-pool (https://github.com/coopernurse/node-pool) constructor
-// allowing you to fully configure the behavior of both
+// and the pool constructor, allowing you to fully configure the behavior of both
 const pool2 = new Pool({
   database: 'postgres',
   user: 'brianc',