Update changes file.

CHANGES

@@ -13,9 +13,13 @@ Changes between 1.4.0 and 2.0.0
  * Fixed issue where user-defined pool name would be overridden by the
    automatically generated name.
 
- * Fix NPE when one of either username and password is defined, and the
+ * Fixed NPE when one of either username and password is defined, and the
    other is null.
 
+ * Fixed issue tracking the statements when there are mixed statement
+   types (Statement, PreparedStatement, etc.) open on the connection and
+   the number of unclosed statements exceeds 32.
+ 
  * HikariDataSource now implements the Closable interface.
  
 Changes between 1.3.9 and 1.4.0