Optimization .webp

[alkorlos]

Safari finally support webp exention. Now all browsers support progressive format, but there is no way to conveniently optimize it.
imagemin-webp can convert to webp, can`t optimized webp.

Sorry for duplicate #205, but perhaps other defaults are relevant now, not the same as four years ago? I think now webp more important than gif.
If you think this is still not default, please at least add webp to validExtensions to be able to optimize this format.

[CCKNBC]

求支持webp
Asking for webp support

[vHeemstra]

As well as JPG, PNG and GIF to WebP conversion? (https://github.com/imagemin/imagemin-webp and https://github.com/imagemin/imagemin-gif2webp)