chore(docs): update readme and audit deps

Author: cnishina

README.md

@@ -6,11 +6,10 @@ Protractor [![Build Status](https://travis-ci.org/angular/protractor.svg?branch=
 Compatibility
 -------------
 
-Protractor 5 is compatible with nodejs v6 and newer.
+Protractor 6 is compatible with nodejs v8.8 and newer. Tests written in Protractor 6 must be written as async / await.
 
 Protractor works with AngularJS versions greater than 1.0.6/1.1.4, and is compatible with Angular applications. Note that for Angular apps, the `binding` and `model` locators are not supported. We recommend using `by.css`.
 
-
 Getting Started
 ---------------
 See the [Protractor Website](http://www.protractortest.org) for most documentation.