Bumping k8s dependencies to 1.13

vendor/golang.org/x/oauth2/README.md

@@ -24,7 +24,9 @@ See godoc for further documentation and examples.
 
 In change 96e89be (March 2015), we removed the `oauth2.Context2` type in favor
 of the [`context.Context`](https://golang.org/x/net/context#Context) type from
-the `golang.org/x/net/context` package
+the `golang.org/x/net/context` package. Later replaced by the standard `context` package
+of the [`context.Context`](https://golang.org/pkg/context#Context) type.
+
 
 This means it's no longer possible to use the "Classic App Engine"
 `appengine.Context` type with the `oauth2` package. (You're using
@@ -44,7 +46,7 @@ with the `oauth2` package.
 
 ```go
 import (
-	"golang.org/x/net/context"
+	"context"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
 	newappengine "google.golang.org/appengine"
@@ -68,6 +70,13 @@ func handler(w http.ResponseWriter, r *http.Request) {
 }
 ```
 
+## Policy for new packages
+
+We no longer accept new provider-specific packages in this repo. For
+defining provider endpoints and provider-specific OAuth2 behavior, we
+encourage you to create packages elsewhere. We'll keep the existing
+packages for compatibility.
+
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