add linting (and some initial fixes)

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diff --git a/node_modules/lodash.difference/README.md b/node_modules/lodash.difference/README.md
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+# lodash.difference v4.5.0
+
+The [lodash](https://lodash.com/) method `_.difference` exported as a [Node.js](https://nodejs.org/) module.
+
+## Installation
+
+Using npm:
+```bash
+$ {sudo -H} npm i -g npm
+$ npm i --save lodash.difference
+```
+
+In Node.js:
+```js
+var difference = require('lodash.difference');
+```
+
+See the [documentation](https://lodash.com/docs#difference) or [package source](https://github.com/lodash/lodash/blob/4.5.0-npm-packages/lodash.difference) for more details.