v5.1.1

• fixed a bug where safari would not call onended if the currentTime of the audio element got set to a value equal to the duration
• fixed a bug where visibility change would call unmute and but the gain value was not a number
• fixed bug where player was calling next() even though willPlayNext indicated that queue is empty (and loop queue was not active)
• removed the console.warn when there are no more sounds in the queue, the willPlayNext of the onEnded callback already tells you there is no next sound
• reverted change that would round duration and currentTime, I think it is best to return the original value and let the UI decide how it wants to format it, revert audio element preload value (from "metadata") to "auto"