Added wagtail-alt-generator module to the media section (#22)

README.md

@@ -88,6 +88,7 @@ Awesome Wagtail [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38
 
 - [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.
 
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