Update vault/api and vault/sdk (#60)

Also use the "inconsistent" and "forward" headers defined in
vault/sdk.

Author: tvoran

go.mod

@@ -6,12 +6,9 @@ require (
 	github.com/aws/aws-sdk-go v1.41.10
 	github.com/fatih/color v1.10.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1
-	github.com/hashicorp/vault/api v1.2.0
-	github.com/hashicorp/vault/sdk v0.2.1
+	github.com/hashicorp/vault/api v1.4.1
+	github.com/hashicorp/vault/sdk v0.4.1
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/stretchr/testify v1.7.0
-	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 // indirect
-	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 // indirect
 )