Allow Bonjour.JS to be used in Electron renderer

[soundprojects]

No description provided.

[hackergrrl]

This will call the function broadcast twice in Node.

[hackergrrl]

Nice! Today I learned about unref().

1. Could you run your PR through standard and fix up the linter warnings?
2. What do you think about adding a comment noting that your code change is present because Electron's renderer doesn't support unref()?

[hackergrrl]

Addresses #32

[soundprojects]

Will do!

[dsamarin]

@Audiow @noffle It would still be a good thing to clear up resources with unref() even in the renderer process. A better solution would be to access the Node.js timers explicitly with require('timers') as is done in pull request #39