Update README.md

Updated Gradle Build badge branch

README.md

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 # RESO Commander
 
-[![CodeFactor](https://www.codefactor.io/repository/github/resostandards/web-api-commander/badge)](https://www.codefactor.io/repository/github/resostandards/web-api-commander)  ![Java CI with Gradle](https://github.com/RESOStandards/web-api-commander/workflows/Java%20CI%20with%20Gradle/badge.svg?branch=master)
+[![CodeFactor](https://www.codefactor.io/repository/github/resostandards/web-api-commander/badge)](https://www.codefactor.io/repository/github/resostandards/web-api-commander)  ![Java CI with Gradle](https://github.com/RESOStandards/web-api-commander/workflows/Java%20CI%20with%20Gradle/badge.svg?branch=main)
 
 The RESO Commander is an OData client Java library and command-line client, 
 as well as an automated RESO Certification testing tool.
@@ -34,4 +34,4 @@ run in a Docker container.
 
 ## [Codegen](/doc/Codegen.md)
 The RESO Commander may also be used to generate reference XML Metadata, DDL, database seeds,
-automated acceptance tests, reference server models, and to convert XML Metadata to Open API 3 format.
+automated acceptance tests, reference server models, and to convert XML Metadata to Open API 3 format.