Update vendor dependencies

vendor/google.golang.org/appengine/remote_api/client_test.go

@@ -5,7 +5,12 @@
 package remote_api
 
 import (
+	"log"
+	"net/http"
 	"testing"
+
+	"golang.org/x/net/context"
+	"google.golang.org/appengine/datastore"
 )
 
 func TestAppIDRE(t *testing.T) {
@@ -22,3 +27,17 @@ func TestAppIDRE(t *testing.T) {
 		}
 	}
 }
+
+func ExampleClient() {
+	c, err := NewClient("example.appspot.com", http.DefaultClient)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	ctx := context.Background() // or from a request
+	ctx = c.NewContext(ctx)
+	_, err = datastore.Put(ctx, datastore.NewIncompleteKey(ctx, "Foo", nil), struct{ Bar int }{42})
+	if err != nil {
+		log.Fatal(err)
+	}
+}