chore(docs): elaborate node/npm prereqs (#2534)

Author: filipesilva

README.md

@@ -26,7 +26,8 @@ You can update your `beta.10` projects to `beta.14` by following [these instruct
 
 ## Prerequisites
 
-The generated project has dependencies that require **Node 4.x.x and NPM 3.x.x**.
+Both the CLI and generated project have dependencies that require Node 4 or higher, together
+with NPM 3 or higher.
 
 ## Table of Contents