mod: add auto-added go mod changes

When running the make DEPGET target for the go-fuzz binaries, this entry
is auto added, even though we don't have a direct reference to it in our
code. Not sure why this is needed in the first place.

go.mod

@@ -21,6 +21,7 @@ require (
 	github.com/davecgh/go-spew v1.1.1
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
 	github.com/dustin/go-humanize v1.0.0 // indirect
+	github.com/dvyukov/go-fuzz v0.0.0-20200916044129-21309f307f61 // indirect
 	github.com/go-errors/errors v1.0.1
 	github.com/go-openapi/strfmt v0.19.5 // indirect
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect