Update index.js

[fridolinvii]

Change tty to tty-browserify. This resolved an issue i had during compiling.

[knownasilya]

What was your issue and which version of node and npm did you use?

[knownasilya]

Comment from the tty-browserify repo: Browserify uses this module when you do require('tty') in a bundle. You should normally not use it directly.

Seems like you tried to use this module from the browser? tty is built into node and if you need to use this module in the browser you should shim tty with tty-browserify, but that should happen at the bundling/build tool level.