Newman: Do not sync readme in dockerhub

[AlphaWong]

In dockerhub readme ( https://hub.docker.com/r/postman/newman/ )

In github readme ( https://github.com/postmanlabs/newman/tree/master/docker )

Issue

following sh will not work. Please update the document in order to help the new user.

docker run -t postman/newman --url="https://www.getpostman.com/collections/8a0c9bc08f062d12dcda"

[kunagpal]

@AlphaWong Thanks for pointing this out, I've corrected the typo.

[AlphaWong]

@kunagpal the updated readme is still incorrect.

docker run -t postman/newman ***run*** "https://www.getpostman.com/collections/8a0c9bc08f062d12dcda"

[kunagpal]

Fixed 😄