Update README.md

README.md

@@ -28,7 +28,7 @@ pip install git+https://github.com/notcammy/PyInstaLive.git --process-dependency
 ```
 
 #### Note
-You need [Git](https://git-scm.com/downloads) and [Python 2.7.x](https://www.python.org/downloads/release/python-2713/) with [Pip](https://pip.pypa.io/en/stable/installing/) installed before you can install and use this script.
+You need [ffmpeg](https://ffmpeg.org/download.html), [Git](https://git-scm.com/downloads) and [Python 2.7.x](https://www.python.org/downloads/release/python-2713/) with [Pip](https://pip.pypa.io/en/stable/installing/) installed before you can install and use this script.
 
 ## Usage
 ```bash