docs: update changelog

Author: sushantdhiman

CHANGELOG.md

@@ -1,10 +1,17 @@
 # Changelog
 
-## 7.x
+## 8.0.0
+
+- fix: correctly default pool configuration options, fixes [#48](https://github.com/sequelize/sequelize-pool/issues/48)
+
+## 7.1.0
 
-- breaking: Support only `Node >= 10`
 - fix: `acquire` not resolving after destroying available resources
 
+## 7.0.0
+
+- breaking: Support only `Node >= 10`
+
 ## 6.0.0
 
 - change: `destory` (and `destoryAllNow`) are async now, they wait for `factory.destory`