Add a method for directly checking for an update

[yeoman]

Add a method for directly checking for an update

[sindresorhus]

It's in the options as it's not the main way to use this module. Ideally, it would support promises too. I think that would be a better change.

[sindresorhus]

Actually, I think we should just deprecate the callback option and add a updateNotifier.check() method that returns a Promise for the update.

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[LitoMore]

I have already solved this issue in the #151.

[LitoMore]

We can use the updateNotifier.checkNpm() to get the version info, and it has already refactored to Promise.

[LitoMore]

I will make a new pull request to deprecate the callback option.

[sindresorhus]

Fixed by #158

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