Configure "babel-eslint" as main parser

To allow to lint all valid Babel code babel-eslint (1) has been included
and specified as main parser (2).

References:

  (1) https://github.com/babel/babel-eslint
  (2) https://eslint.org/docs/user-guide/configuring#specifying-parser

GH-15

.eslintrc.js

@@ -19,6 +19,7 @@ const { resolve } = require("path");
 
 module.exports = {
   extends: "arcticicestudio",
+  parser: "babel-eslint",
   env: {
     browser: true,
     node: true