README: Fix link to plugin documentation.

The previous link is dead.

Author: archit

README.md

@@ -215,6 +215,6 @@ The following properties are expected to be present on the deployment `context`
 
 - `npm test`
 
-[1]: http://ember-cli.github.io/ember-cli-deploy/plugins "Plugin Documentation"
+[1]: http://ember-cli-deploy.com/ "Plugin Documentation"
 [2]: https://github.com/ember-cli-deploy/ember-cli-deploy-build "ember-cli-deploy-build"
 [3]: https://github.com/ember-cli/ember-cli-deploy "ember-cli-deploy"