Unnessesary published files

[jaydenseric]

Unnecessary files (tests) are published to npm:

https://unpkg.com/browse/promise-timeout@1.3.0/

Only publishing necessary files keeps the size of people's node_modules lean.

I suggest using the package.json files field to whitelist what gets published.

[itsmunim]

Or the .npmignore to define what to ignore. Amazing lib nonetheless!