Fix support for polyfilling Array.prototype.values in core-js@2

[existentialism]

Q	A
Fixed Issues?
Patch: Bug Fix?	Y
Tests Added + Pass?	N/Y
License	MIT

I was chatting with @hzoo about this since the comment goes back to when we first created preset-env... and it seems (???) like at the time we might have not included this in the features list for es6.array.iterator because there were not any environments that implemented it at the time (?). But to be honest, not sure. I actually ran into a case within a codebase that used this and preset-env didn't include the polyfill properly.

(Alternative is we can update the documentation to instruct people to include: [es6.array.iterator] if you're using Array.prototype.values(), but that definitely would be unexpected.)

[nicolo-ribaudo]

Oh this is strange.

Could you also check if it needs to be added to the babel-polyfills repo?

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