Adding Flutter bin to the path doesn't expose the dart SDK which many people might be interested in using. For example, dartdoc for documentation generation.
Change the flutter version in README from 1.8.4 to 1.7.8+hotfix.4 to keep it consistent with the first example and also avoid the confusion because 1.8.4 beta does not exist (which will cause a http error if someone copy the code as is).
Tianhao Zhou