Added node.js as prerequisite

Dick Windmeijer · Dick Windmeijer · commit 2c008933c732 · 2018-01-05T11:20:00.000+01:00
diff --git a/README.md b/README.md
@@ -8,6 +8,7 @@ Feedback is appreciated (by email or by adding an issue ticket on this repo).
 
 
 ## Prerequisites
+- Node.js (version >= 8)
 - Google Chrome (version >= 61)
 
 ## Installation
