README.md in async_cable-0.2.0 vs README.md in async_cable-0.2.1

@@ -92,9 +92,14 @@
   };
 ```
 
 ## Development
 
+### Building version
+
+    gem_push=false rake release
+    gem push pkg/async_cable-X.Y.Z.gem
+
 will use [Semver](https://semver.org) from version `1.0.0`
 
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/senid231/async_cable. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the [code of conduct](https://github.com/[USERNAME]/async_cable/blob/master/CODE_OF_CONDUCT.md).