Fix Node#warn() return type

[ybiquitous]

I think Node#warn() should return Warning, not void:

postcss/lib/node.js

Lines 70 to 74 in 8718e06

	warn(result, text, opts) {
	let data = { node: this }
	for (let i in opts) data[i] = opts[i]
	return result.warn(text, data)
	}

[ai]

LGTM.

I will try to merge it and release when I will be back from anti-war protest.

[ybiquitous]

Thank you! 😊

[ai]

Thanks for the fix. Released in 8.4.7.