Fade only stops when target volume has at most 2 decimal places

[MatejKafka]

When fade gets provided with target volume that has over 2 decimal places (e.g. 0.158,...), it continues to rise indefinitely - eventually, it clips either at 0 or 1.

This is caused by using 0.01 update step and not checking if target volume was passed.

Solution: change https://github.com/goldfire/howler.js/blob/master/src/howler.core.js#L1138 to if (vol > to) { and add howl.volume(to, id) (to set the precise value as expected).