Fixed README

Signed-off-by: chandr-andr (Kiselev Aleksandr) <chandr@chandr.net>

Author: chandr-andr

README.md

@@ -35,16 +35,16 @@ Or you can build it by yourself. To do it, install stable rust and [maturin](htt
 ## Usage
 
 Usage is as easy as possible.
-Create new instance of PSQLPool and start querying.
+Create new instance of ConnectionPool and start querying.
 You don't need to startup connection pool, the connection pool will create connections as needed.
 
 ```python
 from typing import Any
 
-from psqlpy import PSQLPool, QueryResult
+from psqlpy import ConnectionPool, QueryResult
 
 
-db_pool = PSQLPool(
+db_pool = ConnectionPool(
     username="postgres",
     password="pg_password",
     host="localhost",