Update dependencies to enable Greenkeeper 🌴 (#6)

* chore(package): update dependencies

* docs(readme): add Greenkeeper badge

Author: greenkeeper[bot]

README.md

@@ -1,6 +1,6 @@
 # secure-json-parse
 
-[![Build Status](https://dev.azure.com/fastify/fastify/_apis/build/status/fastify.secure-json-parse?branchName=master)](https://dev.azure.com/fastify/fastify/_build/latest?definitionId=8&branchName=master) [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](http://standardjs.com/)
+[![Build Status](https://dev.azure.com/fastify/fastify/_apis/build/status/fastify.secure-json-parse?branchName=master)](https://dev.azure.com/fastify/fastify/_build/latest?definitionId=8&branchName=master) [![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](http://standardjs.com/) [![Greenkeeper badge](https://badges.greenkeeper.io/fastify/secure-json-parse.svg)](https://greenkeeper.io/)
 
 `JSON.parse()` drop-in replacement with prototype poisoning protection.
 

package.json

@@ -26,5 +26,10 @@
   "devDependencies": {
     "standard": "^14.3.1",
     "tap": "^12.7.0"
+  },
+  "greenkeeper": {
+    "ignore": [
+      "tap"
+    ]
   }
 }