chore(package): update long to version 4.0.0 (#72)

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
   "devDependencies": {
     "benchmark": "^2.1.4",
     "is-my-json-valid": "^2.17.1",
-    "long": "^3.2.0",
+    "long": "^4.0.0",
     "pre-commit": "^1.2.2",
     "proxyquire": "^1.8.0",
     "standard": "^10.0.3",