Update readme.md (#13691)

Author: qiaozha

specification/billing/resource-manager/readme.md

@@ -102,9 +102,9 @@ swagger-to-sdk:
   - repo: azure-sdk-for-js
   - repo: azure-sdk-for-node
   - repo: azure-sdk-for-ruby
-  - repo: azure-cli-extensions
     after_scripts:
       - bundle install && rake arm:regen_all_profiles['azure_mgmt_billing']
+  - repo: azure-cli-extensions
   - repo: azure-resource-manager-schemas
     after_scripts:
       - node sdkauto_afterscript.js billing/resource-manager