Give an earlier build warning when using Node 4

cjbj · cjbj · commit 47ee5e17159d · 2015-09-25T18:02:03.000+10:00
diff --git a/package.json b/package.json
@@ -43,8 +43,9 @@
   "scripts": {
       "test": "node_modules/mocha/bin/mocha -R spec --timeout 10000 test/*.js"
   },
+  "engineStrict": true,
   "engines": {
-    "node": ">=0.10.28"
+    "node": ">=0.10.28 <3"
   },
   "maintainers": [
     {
