Inconsistent findLyrics calls

[tgambet]

When calling findLyrics several times in a row, results may differ since it gives the lyrics found in the fastest responding website as per this code :

alltomp3/index.js

Lines 192 to 201 in 7129f17

	promises.push(reqWikia);
	promises.push(reqParolesNet);
	promises.push(reqLyricsMania1);
	promises.push(reqLyricsMania2);
	promises.push(reqLyricsMania3);
	promises.push(reqSweetLyrics);
	return Promise.any(promises).then((lyrics) => {
	return lyrics;
	});

This might be the best for speed, but not for consistency as one will get different lyrics on different calls.
The code above could be replaced with something like:

return reqWikia
    .catch(() => reqParolesNet)
    .catch(() => reqLyricsMania1)
    .catch(() => reqLyricsMania2)
    .catch(() => reqLyricsMania3)
    .catch(() => reqSweetLyrics)

Requests would still be made in parallel but that would give a preference order to the websites that are requested (in this example first reqWikia, then reqParolesNet, etc...).