update dependencies

vendor/github.com/Azure/go-autorest/autorest/utility.go

@@ -237,3 +237,10 @@ func DrainResponseBody(resp *http.Response) error {
 	}
 	return nil
 }
+
+func setHeader(r *http.Request, key, value string) {
+	if r.Header == nil {
+		r.Header = make(http.Header)
+	}
+	r.Header.Set(key, value)
+}