Update example docker command port bind options (#88)

must use 127.0.0.1 and not `localhost`

Author: Omeryl

README.md

@@ -9,7 +9,7 @@
 
 Try it out:
 ```bash
-docker run -p localhost:8443:8443 -v "${PWD}:/root/project" codercom/code-server code-server --allow-http --no-auth
+docker run -p 127.0.0.1:8443:8443 -v "${PWD}:/root/project" codercom/code-server code-server --allow-http --no-auth
 ```
 
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