Updates hashicorp/go-cleanhttp.

vendor/github.com/hashicorp/go-cleanhttp/cleanhttp.go

@@ -43,7 +43,7 @@ func DefaultClient() *http.Client {
 }
 
 // DefaultPooledClient returns a new http.Client with the same default values
-// as http.Client, but with a non-shared Transport. Do not use this function
+// as http.Client, but with a shared Transport. Do not use this function
 // for transient clients as it can leak file descriptors over time. Only use
 // this for clients that will be re-used for the same host(s).
 func DefaultPooledClient() *http.Client {

vendor/vendor.json

@@ -208,8 +208,10 @@
 			"revisionTime": "2015-10-22T18:15:14Z"
 		},
 		{
+			"checksumSHA1": "Uzyon2091lmwacNsl1hCytjhHtg=",
 			"path": "github.com/hashicorp/go-cleanhttp",
-			"revision": "875fb671b3ddc66f8e2f0acc33829c8cb989a38d"
+			"revision": "ad28ea4487f05916463e2423a55166280e8254b5",
+			"revisionTime": "2016-04-07T17:41:26Z"
 		},
 		{
 			"checksumSHA1": "qmE9mO0WW6ALLpUU81rXDyspP5M=",