Add information about `no-sudo` option in README

[wozniakpl]

I encountered a similar issue to #544

The feature of not needing to use sudo is quite useful, but I believe this information should be clearly mentioned in the README file. It took me some time to realize that this feature is available. 😄

[ueokande]

@wozniakpl Thanks for your report. We will update the README in #624