vendor: update go-oidc to latest

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/boltdb/bolt v1.3.1 // indirect
 	github.com/cockroachdb/cmux v0.0.0-20170110192607-30d10be49292 // indirect
 	github.com/coreos/etcd v3.2.9+incompatible
-	github.com/coreos/go-oidc v0.0.0-20170307191026-be73733bb8cc
+	github.com/coreos/go-oidc v2.0.0+incompatible
 	github.com/coreos/go-semver v0.2.0 // indirect
 	github.com/coreos/go-systemd v0.0.0-20181031085051-9002847aa142 // indirect
 	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect

go.sum

@@ -10,6 +10,8 @@ github.com/coreos/etcd v3.2.9+incompatible h1:3TbjfK5+aSRLTU/KgBC1xlgA2dn2ddYQng
 github.com/coreos/etcd v3.2.9+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-oidc v0.0.0-20170307191026-be73733bb8cc h1:9yuvA19Q5WFkLwJcMDoYm8m89ilzqZ5zEHqdvU+Zbds=
 github.com/coreos/go-oidc v0.0.0-20170307191026-be73733bb8cc/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHoZ1nMCKZlZ9V6mm3/LKc=
+github.com/coreos/go-oidc v2.0.0+incompatible h1:+RStIopZ8wooMx+Vs5Bt8zMXxV1ABl5LbakNExNmZIg=
+github.com/coreos/go-oidc v2.0.0+incompatible/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHoZ1nMCKZlZ9V6mm3/LKc=
 github.com/coreos/go-semver v0.2.0 h1:3Jm3tLmsgAYcjC+4Up7hJrFBPr+n7rAqYeSw/SZazuY=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20181031085051-9002847aa142 h1:3jFq2xL4ZajGK4aZY8jz+DAF0FHjI51BXjjSwCzS1Dk=