lack of instructions how to build jwt tool

[greenpau]

There are no instructions how to build jwt tool. Perhaps, it is worth adding something like this.

cd cmd/jwt
go build -o $GOPATH/bin/jwt

[greenpau]

I also found a reference to it: https://github.com/go-swagger/go-swagger/tree/master/examples/composed-auth#prerequisites

go install github.com/dgrijalva/jwt-go/cmd/jwt

[dgrijalva]

Good point. I forgot that was in there. I'll make a note to add some documentation for the next release.