add support for downloading loom audio

[ihatespawn]

example link: https://www.loom.com/share/313bf71d20ca47b2a35b6634cefdb761

information about error that you get now

error message: "i don't see anything i could download by your link. try a different one!"

[wukko]

if you refer to list of supported services, you'll see that audio downloading from loom is not implemented. this is not a bug, but a limitation based on loom's file type (one big file instead of split video & audio). loom videos can go on for several hours, making live conversion of such files a lengthy & annoying process.

[ihatespawn]

i thought that it said that you can download audio, my mistake for thinking that was a bug.