Update devDependencies to latest versions

Author: EvanHahn

package.json

@@ -41,8 +41,8 @@
     "x-xss-protection": "1.0.0"
   },
   "devDependencies": {
-    "mocha": "^2.4.5",
-    "sinon": "^1.17.3",
+    "mocha": "^3.2.0",
+    "sinon": "^1.17.7",
     "standard": "^8.6.0"
   },
   "scripts": {