fix abra command in documentation

README.md

@@ -31,7 +31,7 @@
 Run
 
 ```bash
-abra app run YOURAPPNAME app gitea -c /etc/gitea/app.ini admin user create --username USERNAME --admin --random-password --email EMAIL
+abra app run YOURAPPNAME app -- gitea -c /etc/gitea/app.ini admin user create --username USERNAME --admin --random-password --email EMAIL
 ```
 
 See the [Gitea command-line documentation](https://docs.gitea.io/en-us/command-line/) for more options.  Make sure not to forget the `-c /etc/gitea/app.ini`.