update release date (Azure#20502)

xiangyan99 · web-flow · commit ec3548bda742 · 2021-09-01T09:37:22.000-07:00
diff --git a/sdk/core/azure-core/CHANGELOG.md b/sdk/core/azure-core/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Release History
 
-## 1.18.0 (Unreleased)
+## 1.18.0 (2021-09-02)
 
 ### Features Added
 
