Updated dependencies

Author: piranna

package.json

@@ -47,16 +47,16 @@
   "gypfile": true,
   "readmeFilename": "README.md",
   "dependencies": {
-    "async": "^2.0.1",
-    "nan": "^2.4.0"
+    "async": "^2.5.0",
+    "nan": "^2.6.2"
   },
   "devDependencies": {
-    "mocha": "~3.3.0",
-    "chai": "~3.5.0",
+    "mocha": "~3.5.0",
+    "chai": "~4.1.1",
     "grunt": "~1.0.1",
-    "grunt-mocha-test": "~0.13.0",
+    "grunt-mocha-test": "~0.13.2",
     "grunt-contrib-watch": "~1.0.0",
-    "grunt-node-gyp": "~3.1.0",
+    "grunt-node-gyp": "~4.0.0",
     "q": "~1.5.0"
   }
 }