update-resources-typescript.md (Azure#18746)

Author: colawwj

specification/resources/resource-manager/readme.typescript.md

@@ -17,6 +17,7 @@ batch:
   - package-managedapplications: true
   - package-templatespecs: true
   - package-subscriptions: true
+  - package-changes: true
 ```
 
 ```yaml $(typescript) && $(package-features) && !$(profile-content)
@@ -67,6 +68,12 @@ typescript:
   output-folder: "$(typescript-sdks-folder)/sdk/resources-subscriptions/arm-resources-subscriptions"
 ```
 
+```yaml $(typescript) && $(package-changes) && !$(profile-content)
+typescript:
+  package-name: "@azure/arm-changes"
+  output-folder: "$(typescript-sdks-folder)/sdk/changes/arm-changes"
+```
+
 ```yaml $(tag)=='package-resources-2018-05' && $(profile-content)=='profile-hybrid-2019-03-01'
 typescript:
   azure-arm: true