Update jwt to newest 3.x version

go.mod

@@ -33,7 +33,7 @@ require (
 	github.com/bugsnag/osext v0.0.0-20130617224835-0dd3f918b21b // indirect
 	github.com/bugsnag/panicwrap v0.0.0-20160118154447-aceac81c6e2f // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/dgrijalva/jwt-go v3.0.1-0.20160831183534-24c63f56522a+incompatible // indirect
+	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
 	github.com/docker/distribution v2.8.2+incompatible // indirect
 	github.com/docker/go-connections v0.4.0
 	github.com/docker/go-units v0.2.1-0.20151230175859-0bbddae09c5a // indirect

go.sum

@@ -33,6 +33,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.0.1-0.20160831183534-24c63f56522a+incompatible h1:ZaDz72vl6QxbdXokqXGO2JCa2tW+Bg2szKgDFj381Ro=
 github.com/dgrijalva/jwt-go v3.0.1-0.20160831183534-24c63f56522a+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
+github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/digitalocean/godo v1.0.1-0.20170317202744-d59ed2fe842b h1:aXxD+fwKx8OmSO88tAzJyu9LTB3QX/2bNZT2070H7TU=
 github.com/digitalocean/godo v1.0.1-0.20170317202744-d59ed2fe842b/go.mod h1:h6faOIcZ8lWIwNQ+DN7b3CgX4Kwby5T+nbpNqkUIozU=
 github.com/docker/distribution v2.8.2+incompatible h1:T3de5rq0dB1j30rp0sA2rER+m322EBzniBPB6ZIzuh8=