Support Go modules

[d-kuro]

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Description

Add support for Go Modules.

$ go mod init github.com/auth0/go-jwt-middleware
go: creating new go.mod: module github.com/auth0/go-jwt-middleware

$ go mod tidy
go: finding module for package github.com/dgrijalva/jwt-go
go: finding module for package github.com/go-martini/martini
go: finding module for package github.com/urfave/negroni
go: finding module for package github.com/gorilla/mux
go: finding module for package github.com/smartystreets/goconvey/convey
go: downloading github.com/dgrijalva/jwt-go v1.0.2
go: downloading github.com/smartystreets/goconvey v1.6.4
go: downloading github.com/go-martini/martini v0.0.0-20170121215854-22fa46961aab
go: found github.com/dgrijalva/jwt-go in github.com/dgrijalva/jwt-go v3.2.0+incompatible
go: found github.com/go-martini/martini in github.com/go-martini/martini v0.0.0-20170121215854-22fa46961aab
go: found github.com/gorilla/mux in github.com/gorilla/mux v1.7.4
go: found github.com/urfave/negroni in github.com/urfave/negroni v1.0.0
go: found github.com/smartystreets/goconvey/convey in github.com/smartystreets/goconvey v1.6.4
go: finding module for package github.com/codegangsta/inject
go: downloading github.com/codegangsta/inject v0.0.0-20150114235600-33e0aa1cb7c0
go: found github.com/codegangsta/inject in github.com/codegangsta/inject v0.0.0-20150114235600-33e0aa1cb7c0

$ go get -u all
go: github.com/smartystreets/assertions upgrade => v1.1.0
go: github.com/gopherjs/gopherjs upgrade => v0.0.0-20200217142428-fce0ec30dd00
go: downloading github.com/smartystreets/assertions v1.1.0
go: downloading github.com/gopherjs/gopherjs v0.0.0-20200217142428-fce0ec30dd00

References

None

Testing

No changes

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[copland]

@d-kuro Thanks for the pull request! Will take a look at this shortly.

[copland]

LGTM