chore(package): update dependencies (#9)

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "jsonpath-to-dot": "~0.2.0"
   },
   "devDependencies": {
-    "chai": "^2.0.0",
-    "mocha": "~2.1.0"
+    "chai": "^3.5.0",
+    "mocha": "~3.1.2"
   }
 }