[core-rest-pipeline] 1.1.0-beta.3 release date (Azure#15523)

Release date for @azure/core-rest-pipeline 1.1.0-beta.3

Reviews appreciated!

Author: sadasant

sdk/core/core-rest-pipeline/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.1.0-beta.3 (Unreleased)
+## 1.1.0-beta.3 (2021-06-03)
 
 - Merged `bearerTokenChallengeAuthenticationPolicy` into `bearerTokenAuthenticationPolicy`. This will keep the functionality of `bearerTokenAuthenticationPolicy`, but also adds the `challengeCallbacks` feature.