Chore: Remove call to lint absent Makefile.js (#129)

In the process, add to the ignore file to explicitly exclude undesired; also lint additional file.

.eslintignore

@@ -1 +1,3 @@
+node_modules
+coverage
 tests/fixtures

index.js

@@ -5,4 +5,6 @@
 
 "use strict";
 
+// https://github.com/mysticatea/eslint-plugin-node/issues/193
+// eslint-disable-next-line node/no-unpublished-require
 module.exports = require("./lib");

package.json

@@ -20,7 +20,7 @@
     "linter"
   ],
   "scripts": {
-    "lint": "eslint Makefile.js lib/**/*.js tests/lib/plugin.js",
+    "lint": "eslint .",
     "test": "npm run lint && npm run test-cov",
     "test-cov": "istanbul cover _mocha -- -c tests/lib/**/*.js",
     "generate-release": "eslint-generate-release",