Update README.md

Author: John-Lin

README.md

@@ -6,7 +6,7 @@ RYU in Docker
 
 Run the container and login (Docker port forwards port 6633 to host port 6633)
 ```
-docker run -it -p 6633:6633 --rm linton/docker-ryu ./bin/ryu-manager /bin/bash
+docker run -it -p 6633:6633 --rm linton/docker-ryu /bin/bash
 ```
 
 or run the specific app `simple_switch_13`