Add ESLint with Standard

Author: Arttse

.eslintrc.yml

@@ -0,0 +1,17 @@
+root: true
+
+extends:
+  - "standard"
+
+parserOptions:
+  ecmaVersion: 9
+  sourceType: "module"
+
+env:
+  node: true
+  es6: true
+
+rules:
+  comma-dangle:
+    - error
+    - always-multiline

package.json

@@ -4,7 +4,9 @@
   "description": "Checks for the presence of URL protocol without a slashes (colon-slash-slash)",
   "main": "index.js",
   "scripts": {
-    "test": "ava"
+    "lint": "eslint .",
+    "lint:fix": "npm run lint -- --fix",
+    "test": "npm run lint && ava"
   },
   "engines": {
     "node": ">=0.10"
@@ -33,6 +35,12 @@
   },
   "homepage": "https://github.com/Arttse/node.is-url-protocol-without-slashes#readme",
   "devDependencies": {
-    "ava": "^1.3.1"
+    "ava": "^1.3.1",
+    "eslint": "^5.15.1",
+    "eslint-config-standard": "^12.0.0",
+    "eslint-plugin-import": "^2.16.0",
+    "eslint-plugin-node": "^8.0.1",
+    "eslint-plugin-promise": "^4.0.1",
+    "eslint-plugin-standard": "^4.0.0"
   }
 }