fix(README.md) remove wagtail-embedvideos (#127)

The extension does not work with newer version of Wagtail.

README.md

@@ -135,7 +135,6 @@ Awesome Wagtail [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38
 ### Media
 
 - [wagtailmedia](https://github.com/torchbox/wagtailmedia) - A Wagtail module for managing video and audio files within the admin.
-- [wagtail-embedvideos](https://github.com/infoportugal/wagtail-embedvideos) - Simple app that works similar to wagtailimages, but for embedding YouTube and Vimeo videos and music from SoundCloud. It's an integration of [django-embed-video](https://github.com/yetty/django-embed-video).
 - [Wagtail Alt Generator](https://github.com/marteinn/wagtail-alt-generator) - A module for generating image description and tags based on computer vision.
 - [Wagtail FilePreviews](https://github.com/filepreviews/wagtail-filepreviews) - Extend Wagtail's Documents with image previews and metadata from FilePreviews.io.
 - [Wagtail-Textract](https://github.com/fourdigits/wagtail_textract) - Make Wagtail search Documents contents (PDF, Excel and Word, etc.).