Update jwt library

- Resolves #186
- Resolves #187
- Resolves #189

go.mod

@@ -5,7 +5,7 @@ go 1.15
 require (
 	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
 	github.com/alecthomas/units v0.0.0-20201120081800-1786d5ef83d4 // indirect
-	github.com/dgrijalva/jwt-go v3.0.1-0.20170608005149-a539ee1a749a+incompatible
+	github.com/golang-jwt/jwt/v4 v4.4.1
 	github.com/stretchr/testify v1.7.0
 	golang.org/x/crypto v0.0.0-20170512130425-ab89591268e0
 	golang.org/x/net v0.0.0-20170513003010-84f0e6f92b10

go.sum

@@ -4,8 +4,8 @@ github.com/alecthomas/units v0.0.0-20201120081800-1786d5ef83d4 h1:EBTWhcAX7rNQ80
 github.com/alecthomas/units v0.0.0-20201120081800-1786d5ef83d4/go.mod h1:OMCwj8VM1Kc9e19TLln2VL61YJF0x1XFtfdL4JdbSyE=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgrijalva/jwt-go v3.0.1-0.20170608005149-a539ee1a749a+incompatible h1:lwWnUpbS8H6DbUpe9VIY8G0vOupN8pnCPs68g9oxAJI=
-github.com/dgrijalva/jwt-go v3.0.1-0.20170608005149-a539ee1a749a+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/golang-jwt/jwt/v4 v4.4.1 h1:pC5DB52sCeK48Wlb9oPcdhnjkz1TKt1D/P7WKJ0kUcQ=
+github.com/golang-jwt/jwt/v4 v4.4.1/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w39/MY0Ch0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=

token/token.go

@@ -9,7 +9,7 @@ import (
 	"sync"
 	"time"
 
-	jwt "github.com/dgrijalva/jwt-go"
+	"github.com/golang-jwt/jwt/v4"
 )
 
 const (