Add Example note re: workaround for npm issue ?

[pk1u]

I believe I ran into this issue while attempting to run example with current versions of node and npm; this was closed because "...this is not actionable for us--it's just how npm bin works.":
facebook/create-react-app#200

Eg, reinstalling node modules resolves this:

$ rm -rf node_modules
$ npm install

Is this issue commonly known, or should this be noted in the example readme ?

[skoob13]

I don't think so. It's a specific case, that should be addressed to create-react-app.