Added option for thumbnail only

[1RandomDev]

I've added an option which downloads the thumbnail of a video only and saves it as JPG.

[KimPig]

When I clicked on the file name, it links to "Filename.webm", not "Filename.jpg". So 404 error occurs. Is there a solution?

[PikuZheng]

When I clicked on the file name, it links to "Filename.webm", not "Filename.jpg". So 404 error occurs. Is there a solution?

try this: https://github.com/PikuZheng/metube/commit/b56d3f0c836b043cb2b39dec9208db1c8306398d

[KimPig]

When I clicked on the file name, it links to "Filename.webm", not "Filename.jpg". So 404 error occurs. Is there a solution?

try this: PikuZheng@b56d3f0

This links to "FileName.webm.jpg"

[PikuZheng]

This links to "FileName.webm.jpg"

.webm.jpg is planned, but the real name is .webm.jpg.jpg...let me try again.

[1RandomDev]

Not the most elegant solution but should be fixed in 0f27bf854560fa37a5fa9f9d9645fe4c321fe487