Drop Node 0.6 support (manifest)

Author: jbpros

package.json

@@ -62,7 +62,7 @@
   },
   "main": "./lib/cucumber",
   "engines": {
-    "node": "0.6 || 0.8 || 0.10 || 0.11"
+    "node": "0.8 || 0.10 || 0.11"
   },
   "dependencies": {
     "browserify": "5.11.1",