Bump snapdragon-util.

[wtgtybhertgeghgtwtg]

To snapdragon-util@4. The latest is snapdragon-util@5.0.1, but that requires node>=6.
All this really does is dedupe the version of kind-of being used and take out the is-buffer transitive dependency.

[jonschlinkert]

Did you test this will all downstream libraries?

[wtgtybhertgeghgtwtg]

Just braces. snapdragon, snapdragon-cheerio, and breakdance all use older versions of snapdragon-node.

[wtgtybhertgeghgtwtg]

This is breaking with the latest snapdragon.

[wtgtybhertgeghgtwtg]

Actually it doesn't, I was mistaken. It works with here-be/snapdragon#18, too.

[jonschlinkert]

closing since this was refactored and snapdragon-util was removed. thanks for the pr!