Serialize range options of compactRange()

[vweevers]

leveldown/leveldown.js

Lines 64 to 66 in 819946c

	LevelDOWN.prototype.compactRange = function (start, end, callback) {
	this.binding.compactRange(start, end, callback)
	}

We should do the same as in approximateSize():

leveldown/leveldown.js

Lines 58 to 61 in 819946c

	start = this._serializeKey(start)
	end = this._serializeKey(end)
	this.binding.approximateSize(start, end, callback)