See how Boundary would look with gofumpt applied (#853)

* See how Boundary would look with https://github.com/mvdan/gofumpt applied

Results of running `gofumpt -w -s .`

* Update tools file and Makefile for gofumpt

Co-authored-by: Jeff Mitchell <jeffrey.mitchell@gmail.com>

api/options.go

@@ -12,8 +12,7 @@ func getOpts(opt ...Option) options {
 type Option func(*options)
 
 // options = how options are represented
-type options struct {
-}
+type options struct{}
 
 func getDefaultOptions() options {
 	return options{}