add linting (and some initial fixes)

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diff --git a/node_modules/lodash.flatten/README.md b/node_modules/lodash.flatten/README.md
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+# lodash.flatten v4.4.0
+
+The [lodash](https://lodash.com/) method `_.flatten` exported as a [Node.js](https://nodejs.org/) module.
+
+## Installation
+
+Using npm:
+```bash
+$ {sudo -H} npm i -g npm
+$ npm i --save lodash.flatten
+```
+
+In Node.js:
+```js
+var flatten = require('lodash.flatten');
+```
+
+See the [documentation](https://lodash.com/docs#flatten) or [package source](https://github.com/lodash/lodash/blob/4.4.0-npm-packages/lodash.flatten) for more details.