github.com/stretchr/testify - main desired update. Old version has bugs.

github.com/davecgh/go-spew/spew is set to the newest version, a bit
newer than required by testify. Updated from version 6 Nov 2015 to
27 Jun 2017.

github.com/stretchr/objx is not updated - testify uses version
from 27 May 2014 which is older than 28 Sep 2015 used now (latest
actually). In practice there is only a tiny difference - one method was
removed in new version.

vendor/github.com/stretchr/testify/assert/BUILD

@@ -10,6 +10,8 @@ load(
 go_library(
     name = "go_default_library",
     srcs = [
+        "assertion_format.go",
+        "assertion_forward.go",
         "assertions.go",
         "doc.go",
         "errors.go",