tools: move eslint from tools to tools/node_modules

This is required because we need to add the babel-eslint dependency
and it has to be able to resolve "eslint".
babel-eslint is required to support future ES features such as async
iterators and import.meta.

Refs: https://github.com/nodejs/node/pull/17755
PR-URL: https://github.com/nodejs/node/pull/17820
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/node_modules/array-union/readme.md b/tools/node_modules/eslint/node_modules/array-union/readme.md
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+# array-union [![Build Status](https://travis-ci.org/sindresorhus/array-union.svg?branch=master)](https://travis-ci.org/sindresorhus/array-union)
+
+> Create an array of unique values, in order, from the input arrays
+
+
+## Install
+
+```
+$ npm install --save array-union
+```
+
+
+## Usage
+
+```js
+const arrayUnion = require('array-union');
+
+arrayUnion([1, 1, 2, 3], [2, 3]);
+//=> [1, 2, 3]
+
+arrayUnion(['foo', 'foo', 'bar'], ['foo']);
+//=> ['foo', 'bar']
+```
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)