refactor repeating code

[batuhan]

No description provided.

[coveralls]

Coverage decreased (-0.1%) to 97.849% when pulling 1189d5f on batuhan:es6 into 5249246 on bcoe:master.

[bcoe]

@batuhan I really like the cleanup of pushing the providers into a list 👍

I usually try to make sure that any tools I write work all the way back to Node 0.10, since folks installing the tool who aren't Node affianodos are often running older platforms.

tldr; perhaps update this patch to include your refactor without the ES2015 constructs.

[batuhan]

I've updated the es6 branch to not include es6 :)

So, just added the checker generator thingy.

There seems to be problem with the whois fallback with my updates. I'm checking it right now.

[coveralls]

Coverage decreased (-0.1%) to 97.849% when pulling 669447b on batuhan:es6 into 5249246 on bcoe:master.

[bcoe]

@batuhan looks good to me, coverage just dropped because you reduced the lines of code with cleanup.

any reason not to land this?