CHANGELOG.md in onnxruntime-0.6.3 vs CHANGELOG.md in onnxruntime-0.6.4

@@ -1,4 +1,8 @@
+## 0.6.4 (2021-09-22)
+
+- Updated ONNX Runtime to 1.9.0
+
 ## 0.6.3 (2021-07-08)
 
 - Updated ONNX Runtime to 1.8.1
 
 ## 0.6.2 (2021-06-03)