Does not work on Safari

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See https://forum.vuejs.org/t/safari-audio-play-notallowederror-dom-exception-35/25099

Maybe this can be fixed by checking if it is an iPhone and if so let the user actively hit a button to start the next iteration?

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Maybe consider using webrtc as this allows to use PCM instead of ogg in firefox, see https://github.com/muaz-khan/RecordRTC

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Introduced warning for safari based browsers in fa47cd8

Tried out triggiering play from a button (still async errors - maybe v-on:click or vue methods gets handled as async automatically) and also changing the src from a playing audio - both did not work.

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Turns out that this has nothing to do with the async playback but with the inability of safari to playback recorded blobs, see

https://bugs.webkit.org/show_bug.cgi?id=85851
and
muaz-khan/RecordRTC#655

=> Can not be fixed without writing a backend for conversions of the blobs which is out of scope