Add ESLint.

.eslintrc.js

@@ -0,0 +1,13 @@
+module.exports = {
+  env: {
+    es6: true,
+    mocha: true,
+    node: true
+  },
+  parserOptions: {
+    ecmaVersion: 2017
+  },
+  rules: {
+    "no-unused-vars": "warn"
+  }
+};

package.json

@@ -13,11 +13,16 @@
   "dependencies": {},
   "devDependencies": {
     "@nodeguy/assert": "0.1.4",
+    "eslint": "4.12.1",
     "mocha": "4.0.1",
     "nyc": "11.3.0"
   },
   "homepage": "https://github.com/NodeGuy/channel",
-  "keywords": ["CSP", "channel", "concurrency"],
+  "keywords": [
+    "CSP",
+    "channel",
+    "concurrency"
+  ],
   "license": "Apache-2.0",
   "main": "lib/index.js",
   "repository": {
@@ -33,6 +38,9 @@
     "functions": 100,
     "lines": 100,
     "statements": 100,
-    "reporter": ["html", "text-summary"]
+    "reporter": [
+      "html",
+      "text-summary"
+    ]
   }
 }