fix for pytube

lib/pytube/README.md

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+<div align="center">
+  <p>
+    <a href="#"><img src="https://assets.nickficano.com/gh-pytube.min.svg" width="456" height="143" alt="pytube logo" /></a>
+  </p>
+  <p align="center">
+	<a href="https://pypi.org/project/pytube/"><img src="https://img.shields.io/pypi/dm/pytube?style=flat-square" alt="pypi"/></a>
+	<a href="https://pytube.io/en/latest/"><img src="https://readthedocs.org/projects/python-pytube/badge/?version=latest&style=flat-square" /></a>
+	<a href="https://pypi.org/project/pytube/"><img src="https://img.shields.io/pypi/v/pytube?style=flat-square" /></a>
+  </p>
+</div>
+
+### Actively soliciting contributors!
+
+Have ideas for how pytube can be improved? Feel free to open an issue or a pull request!
+
+# pytube
+
+*pytube* is a genuine, lightweight, dependency-free Python library (and command-line utility) for downloading YouTube videos.
+
+## Documentation
+
+Detailed documentation about the usage of the library can be found at [pytube.io](https://pytube.io). This is recommended for most cases. If you want to hastily download a single video, the [quick start](#Quickstart) guide below might be what you're looking for.
+
+## Description
+
+YouTube is the most popular video-sharing platform in the world and as a hacker, you may encounter a situation where you want to script something to download videos. For this, I present to you: *pytube*.
+
+*pytube* is a lightweight library written in Python. It has no third-party
+dependencies and aims to be highly reliable.
+
+*pytube* also makes pipelining easy, allowing you to specify callback functions for different download events, such as  ``on progress`` or ``on complete``.
+
+Furthermore, *pytube* includes a command-line utility, allowing you to download videos right from the terminal.
+
+## Features
+
+- Support for both progressive & DASH streams
+- Support for downloading the complete playlist
+- Easily register ``on_download_progress`` & ``on_download_complete`` callbacks
+- Command-line interfaced included
+- Caption track support
+- Outputs caption tracks to .srt format (SubRip Subtitle)
+- Ability to capture thumbnail URL
+- Extensively documented source code
+- No third-party dependencies
+
+## Quickstart
+
+This guide covers the most basic usage of the library. For more detailed information, please refer to [pytube.io](https://pytube.io).
+
+### Installation
+
+Pytube requires an installation of Python 3.6 or greater, as well as pip. (Pip is typically bundled with Python [installations](https://python.org/downloads).)
+
+To install from PyPI with pip:
+
+```bash
+$ python -m pip install pytube
+```
+
+Sometimes, the PyPI release becomes slightly outdated. To install from the source with pip:
+
+```bash
+$ python -m pip install git+https://github.com/pytube/pytube
+```
+
+### Using pytube in a Python script
+
+To download a video using the library in a script, you'll need to import the YouTube class from the library and pass an argument of the video URL. From there, you can access the streams and download them.
+
+```python
+ >>> from pytube import YouTube
+ >>> YouTube('https://youtu.be/2lAe1cqCOXo').streams.first().download()
+ >>> yt = YouTube('http://youtube.com/watch?v=2lAe1cqCOXo')
+ >>> yt.streams
+  ... .filter(progressive=True, file_extension='mp4')
+  ... .order_by('resolution')
+  ... .desc()
+  ... .first()
+  ... .download()
+```
+
+### Using the command-line interface
+
+Using the CLI is remarkably straightforward as well. To download a video at the highest progressive quality, you can use the following command:
+```bash
+$ pytube https://youtube.com/watch?v=2lAe1cqCOXo
+```
+
+You can also do the same for a playlist:
+```bash
+$ pytube https://www.youtube.com/playlist?list=PLS1QulWo1RIaJECMeUT4LFwJ-ghgoSH6n
+```