CHANGELOG.md in numo-openblas-0.4.7 vs CHANGELOG.md in numo-openblas-0.4.8

@@ -1,4 +1,7 @@
+## 0.4.8
+- Change the version of OpenBLAS to be downloaded to 0.3.21.
+
 ## 0.4.7
 - Refactor codes and configs with RuboCop.
 
 ## 0.4.6
 - Change the version of OpenBLAS to be downloaded to 0.3.20.