add prop to package.json

Author: Bo Lingen

package.json

@@ -3,6 +3,9 @@
  "version": "0.4.2",
  "description": "Compile LightScript to JavaScript.",
  "main": "index.js",
+ "engines": {
+ "node": ">=4"
+ },
  "scripts": {
  "test": "mocha test",
  "test:debug": "node --inspect --debug-brk mocha test",