format code with gofumpt

gofumpt (https://github.com/mvdan/gofumpt) provides a supserset of `gofmt` / `go fmt`,
and addresses various formatting issues that linters may be checking for.

We can consider enabling the `gofumpt` linter to verify the formatting in CI, although
not every developer may have it installed, so for now this runs it once to get formatting
in shape.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cmd/digest/main.go

@@ -62,7 +62,6 @@ func main() {
 	if flag.NArg() > 0 {
 		for _, path := range flag.Args() {
 			fp, err := os.Open(path)
-
 			if err != nil {
 				log.Printf("%s: %v", path, err)
 				fail = true