add linting (and some initial fixes)

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diff --git a/node_modules/is-generator-fn/readme.md b/node_modules/is-generator-fn/readme.md
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+# is-generator-fn [![Build Status](https://travis-ci.org/sindresorhus/is-generator-fn.svg?branch=master)](https://travis-ci.org/sindresorhus/is-generator-fn)
+
+> Check if something is a [generator function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*)
+
+
+## Install
+
+```
+$ npm install --save is-generator-fn
+```
+
+
+## Usage
+
+```js
+const isGeneratorFn = require('is-generator-fn');
+
+isGeneratorFn(function * () {});
+//=> true
+
+isGeneratorFn(function () {});
+//=> false
+```
+
+
+## License
+
+MIT © [Sindre Sorhus](http://sindresorhus.com)