test(base): Add test script

Allows Travis builds to build

Author: Ray Schamp

package.json

@@ -4,7 +4,7 @@
   "description": "Shareable ESLint config for Scratch",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "eslint .",
     "semantic-release": "semantic-release pre && npm publish && semantic-release post"
   },
   "repository": {