Note that this project has been considered deprecated in favor of using img-convert for conversions from and to multiple other formats, also made in Go and works the same way.
go run main.go image1.webp [image2.webp] [..]
The output file will be in the same directory as the inputs, appending .webp
onto the original file. For an input of /path/to/image.webp, the program will
convert and put the output as /path/to/image.webp.png.