Update change log

CHANGES

@@ -6,17 +6,16 @@ Changes in 2.4.7
 
  * Removed Oracle SQL state 61000, added specific error code (2399) to evict connections
    when it is encountered.
-   
- * issue 641, 643: Reflection used method String.toUpperCase() without a Locale, which causes
+
+ * issue 664: do not recycle PoolEntry objects that have closed their held connection.
+
+ * issue 641, 643: reflection used method String.toUpperCase() without a Locale, which causes
    problems in some locales such as Turkish.
 
- * pull 632: Added support for Prometheus metrics tracker.
+ * pull 632: added support for Prometheus metrics tracker.
  
  * issue 650: detect Amazon Redshift connection refused error codes.
 
- * Added Oracle SQL error code 61000 (exceeded maximum connect time) to evict connections
-   when it is encountered.
-
 Changes in 2.4.6
 
  * Added Oracle SQL error code 61000 (exceeded maximum connect time) to evict connections