Fix web kubeconfig extraopts flag parse

Wring flag type, changing to StringToString.

Also, update dependencies, we include a bugfix from
viper allowing us to remove a dirty fix.

Fixes #37

go.mod

@@ -6,15 +6,15 @@ require (
 	github.com/cenkalti/backoff v2.2.1+incompatible
 	github.com/coreos/go-oidc v2.2.1+incompatible
 	github.com/fsnotify/fsnotify v1.4.9
-	github.com/gobuffalo/packr/v2 v2.8.0
+	github.com/gobuffalo/packr/v2 v2.8.1
 	github.com/julienschmidt/httprouter v1.3.0
 	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c
-	github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
-	github.com/prometheus/client_golang v1.5.1
-	github.com/sirupsen/logrus v1.5.0
-	github.com/spf13/cobra v1.0.0
+	github.com/pquerna/cachecontrol v0.0.0-20201205024021-ac21108117ac // indirect
+	github.com/prometheus/client_golang v1.8.0
+	github.com/sirupsen/logrus v1.7.0
+	github.com/spf13/cobra v1.1.1
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.6.3
-	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
-	gopkg.in/square/go-jose.v2 v2.5.0 // indirect
+	github.com/spf13/viper v1.7.1
+	golang.org/x/oauth2 v0.0.0-20201203001011-0b49973bad19
+	gopkg.in/square/go-jose.v2 v2.5.1 // indirect
 )