add node modules to repo

node_modules/p-limit/readme.md

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+# p-limit [![Build Status](https://travis-ci.org/sindresorhus/p-limit.svg?branch=master)](https://travis-ci.org/sindresorhus/p-limit)
+
+> Run multiple promise-returning & async functions with limited concurrency
+
+
+## Install
+
+```
+$ npm install p-limit
+```
+
+
+## Usage
+
+```js
+const pLimit = require('p-limit');
+
+const limit = pLimit(1);
+
+const input = [
+	limit(() => fetchSomething('foo')),
+	limit(() => fetchSomething('bar')),
+	limit(() => doSomething())
+];
+
+(async () => {
+	// Only one promise is run at once
+	const result = await Promise.all(input);
+	console.log(result);
+})();
+```
+
+
+## API
+
+### pLimit(concurrency)
+
+Returns a `limit` function.
+
+#### concurrency
+
+Type: `number`<br>
+Minimum: `1`
+
+Concurrency limit.
+
+### limit(fn)
+
+Returns the promise returned by calling `fn`.
+
+#### fn
+
+Type: `Function`
+
+Promise-returning/async function.
+
+
+## Related
+
+- [p-queue](https://github.com/sindresorhus/p-queue) - Promise queue with concurrency control
+- [p-throttle](https://github.com/sindresorhus/p-throttle) - Throttle promise-returning & async functions
+- [p-debounce](https://github.com/sindresorhus/p-debounce) - Debounce promise-returning & async functions
+- [p-all](https://github.com/sindresorhus/p-all) - Run promise-returning & async functions concurrently with optional limited concurrency
+- [More…](https://github.com/sindresorhus/promise-fun)
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)