typescript readme update

[lotust]

I'm currently writing a node app in typescript and ran into build errors when first attempting to add the SDK. A small note to yarn install @types/readable-stream @types/request @types/request-promise-native -D as dev dependencies in the readme for the typescript SDK would be helpful, in addition to what's already in Very important note regarding the Looker Typescript SDK

[jkaster]

Thanks for the note! We'll take a look at this.

[pfrisella]

@jkaster Looks like this was addressed awhile ago. Please open again if that's not the case.