Merge pull request #17 from mr-beerkiss/master

Make 6.9 the min version and allow greater major versions

Author: robertmarsal

package.json

@@ -41,6 +41,6 @@
     "sleep": "^5.0.0"
   },
   "engines": {
-    "node": "^6.9"
+    "node": ">=6.9"
   }
 }