Updates deprecated babel-eslint package to @babel/eslint-parser. (#70)

* Updates deprecated babel-eslint package to @babel/eslint-parser.

* also add `@babel/core` to README

Co-authored-by: Pelle Wessman <pelle@kodfabrik.se>

README.md

@@ -34,14 +34,14 @@ provided in `eslint-config-standard`.
 Here's how to install everything you need:
 
 ```bash
-npm install --save-dev babel-eslint eslint-config-standard eslint-config-standard-jsx eslint-config-standard-react eslint-plugin-promise eslint-plugin-import eslint-plugin-node eslint-plugin-react
+npm install --save-dev @babel/core @babel/eslint-parser eslint-config-standard eslint-config-standard-jsx eslint-config-standard-react eslint-plugin-promise eslint-plugin-import eslint-plugin-node eslint-plugin-react
 ```
 
 Then, add this to your `.eslintrc` file:
 
 ```
 {
-  "parser": "babel-eslint",
+  "parser": "@babel/eslint-parser",
   "extends": ["standard", "standard-jsx", "standard-react"]
 }
 ```