Add empty lint command

package.json

@@ -4,6 +4,7 @@
   "description": "[json-rpc-engine](https://github.com/kumavis/json-rpc-engine) middleware implementing ethereum filter methods. Backed by an [eth-block-tracker](https://github.com/MetaMask/eth-block-tracker) and web3 provider interface (`web3.currentProvider`).",
   "main": "index.js",
   "scripts": {
+    "lint": "printf '%s\\n' 'No lint command'",
     "test": "node test"
   },
   "author": "",