Update kubernetes to 1.16.0-rc.2

Signed-off-by: Lantao Liu <lantaol@google.com>

vendor/github.com/stretchr/testify/README.md

@@ -287,8 +287,10 @@ To install Testify, use `go get`:
 This will then make the following packages available to you:
 
     github.com/stretchr/testify/assert
+    github.com/stretchr/testify/require
     github.com/stretchr/testify/mock
-    github.com/stretchr/testify/http
+    github.com/stretchr/testify/suite
+    github.com/stretchr/testify/http (deprecated)
 
 Import the `testify/assert` package into your code using this template:
 
@@ -319,7 +321,7 @@ To update Testify to the latest version, use `go get -u github.com/stretchr/test
 Supported go versions
 ==================
 
-We support the three major Go versions, which are 1.8, 1.9 and 1.10 at the moment.
+We support the three major Go versions, which are 1.9, 1.10, and 1.11 at the moment.
 
 ------
 
@@ -329,3 +331,10 @@ Contributing
 Please feel free to submit issues, fork the repository and send pull requests!
 
 When submitting an issue, we ask that you please include a complete test function that demonstrates the issue.  Extra credit for those using Testify to write the test code that demonstrates it.
+
+------
+
+License
+=======
+
+This project is licensed under the terms of the MIT license.