[phone numbers sdk] Update minimum version of dependency "@azure/core… (Azure#21202)

* [phone numbers sdk] Update minimum version of dependency "@azure/core-client" to "1.5.0"

* [phone number sdk] Improved README

Author: automagicaly

sdk/communication/communication-phone-numbers/CHANGELOG.md

@@ -12,6 +12,8 @@
 
 ### Other Changes
 
+- Update minimum version of dependency "@azure/core-client" to "1.5.0", which allows adding additional policies to the rest pipeline after initialization.
+
 ## 1.2.0-beta.2 (2022-03-10)
 
 ### Features Added

sdk/communication/communication-phone-numbers/package.json

@@ -63,7 +63,7 @@
     "@azure/communication-common": "^2.0.0",
     "@azure/abort-controller": "^1.0.0",
     "@azure/core-auth": "^1.3.0",
-    "@azure/core-client": "^1.3.0",
+    "@azure/core-client": "^1.5.0",
     "@azure/core-rest-pipeline": "^1.3.0",
     "@azure/core-lro": "^2.2.4",
     "@azure/core-paging": "^1.1.1",