Add .wav to supported file uploads

[lalabuy948]

Hi, I was looking for exactly for what your application does, but I faced weird issue when was trying to upload files from iPhone safari, I dived a bit into and added .wav support since it's not in the audio/* list.

https://www.iana.org/assignments/media-types/media-types.xhtml#audio

Hope you don't mind merging it.

[alexeynefdef]

Hey @lalabuy948, I had the same issue on my iPhone, but it works when you drag'n'drop the sample from files into browser (not select from files in browser), but I can only play those samples and they aren't in PO at the end.

[rileyjshaw]

Hi @lalabuy948, I’m sorry for the delay! Thanks for the contribution - I’ll be happy to merge this change.

Before I merge it, are you able to test to make sure .wav files still aren’t included in audio/* in the latest iOS?

Thanks!