Add linter

.solhint.json

@@ -0,0 +1,12 @@
+{
+  "extends": "solhint:recommended",
+  "rules": {
+    "max-line-length": ["error", 99],
+    "separate-by-one-line-in-contract": "error",
+    "two-lines-top-level-separator": "error",
+    "func-order": "error",
+    "reason-string": ["error"],
+    "constructor-syntax": "error",
+    "compiler-version": "0.5.13"
+  }
+}

README.md

@@ -53,4 +53,4 @@ See [our contributing instructions](CONTRIBUTING.md).
 
 ### Security Issues
 
-If you find a vulnerability that may affect live or testnet deployments, please send your report privately to [security@melonport.com](http://keyserver2.pgp.com/vkd/SubmitSearch.event?SearchCriteria=security%40melonport.com). Please **DO NOT** file a public issue.
+If you find a vulnerability that may affect live or testnet deployments, please send your report privately to [security@meloncouncil.io](mailto:security@meloncouncil.io). Please **DO NOT** file a public issue.

package.json

@@ -26,11 +26,12 @@
   "scripts": {
     "deploy": "GANACHE_KEYS=./keys.json CONF=./deploy_in_testing.json node deploy/scripts/deploy-system.js ./deploy_in_testing.json ./deploy_out_testing.json",
     "devchain": "ganache-cli --gasLimit 0x989680 --defaultBalanceEther 10000000000000 -m 'exhibit now news planet fame thank swear reform tilt accident bitter axis' --networkId=4 --acctKeys ./keys.json",
+    "lint": "solhint src/**/*.sol",
     "test": "GANACHE_KEYS=./keys.json CONF=./deploy_in_testing.json yarn jest --runInBand --detectOpenHandles"
   },
   "devDependencies": {
-    "@0x/types": "^1.3.0",
     "@0x/order-utils": "^8.4.0",
+    "@0x/types": "^1.3.0",
     "@babel/core": "^7.1.6",
     "@babel/preset-env": "^7.1.6",
     "babel-jest": "^24.9.0",
@@ -39,6 +40,7 @@
     "jest": "^24.1.0",
     "jest-matcher-utils": "^24.9.0",
     "request-promise": "^4.2.2",
+    "solhint": "^2.3.0",
     "web3": "1.2.4",
     "web3-eth-abi": "1.2.4",
     "web3-utils": "1.2.4"