[Synapse] - update version for Spark SDK (Azure#17146)

Co-authored-by: Dongwei Wang <dongwwa@microsoft.com>

Author: idear1203

sdk/synapse/Azure.Analytics.Synapse.Spark/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.0.0-beta.1 (Unreleased)
+## 1.0.0-beta.1 (2020-11-22)
 - This release contains bug fixes to improve quality.
 
 ## 1.0.0-preview.2 (2020-09-01)