literally none of these have been updated

Author: gjtorikian

README.md

@@ -343,34 +343,6 @@ service.subscribe "call_text_filters.html_pipeline" do |event, start, ending, tr
 end
 ```
 
-## Third Party Extensions
-
-If you have an idea for a filter, propose it as
-[an issue](https://github.com/gjtorikian/html-pipeline/issues) first. This allows us to discuss
-whether the filter is a common enough use case to belong in this gem, or should be
-built as an external gem.
-
-Here are some extensions people have built:
-
-- [html-pipeline-asciidoc_filter](https://github.com/asciidoctor/html-pipeline-asciidoc_filter)
-- [jekyll-html-pipeline](https://github.com/gjtorikian/jekyll-html-pipeline)
-- [nanoc-html-pipeline](https://github.com/burnto/nanoc-html-pipeline)
-- [html-pipeline-bitly](https://github.com/dewski/html-pipeline-bitly)
-- [html-pipeline-cite](https://github.com/lifted-studios/html-pipeline-cite)
-- [tilt-html-pipeline](https://github.com/bradgessler/tilt-html-pipeline)
-- [html-pipeline-wiki-link'](https://github.com/lifted-studios/html-pipeline-wiki-link) - WikiMedia-style wiki links
-- [task_list](https://github.com/github/task_list) - GitHub flavor Markdown Task List
-- [html-pipeline-nico_link](https://github.com/rutan/html-pipeline-nico_link) - An HTMLPipeline filter for [niconico](http://www.nicovideo.jp) description links
-- [html-pipeline-gitlab](https://gitlab.com/gitlab-org/html-pipeline-gitlab) - This gem implements various filters for html-pipeline used by GitLab
-- [html-pipeline-youtube](https://github.com/st0012/html-pipeline-youtube) - An HTMLPipeline filter for YouTube links
-- [html-pipeline-flickr](https://github.com/st0012/html-pipeline-flickr) - An HTMLPipeline filter for Flickr links
-- [html-pipeline-vimeo](https://github.com/dlackty/html-pipeline-vimeo) - An HTMLPipeline filter for Vimeo links
-- [html-pipeline-hashtag](https://github.com/mr-dxdy/html-pipeline-hashtag) - An HTMLPipeline filter for hashtags
-- [html-pipeline-linkify_github](https://github.com/jollygoodcode/html-pipeline-linkify_github) - An HTMLPipeline filter to autolink GitHub urls
-- [html-pipeline-redcarpet_filter](https://github.com/bmikol/html-pipeline-redcarpet_filter) - Render Markdown source text into Markdown HTML using Redcarpet
-- [html-pipeline-typogruby_filter](https://github.com/bmikol/html-pipeline-typogruby_filter) - Add Typogruby text filters to your HTMLPipeline
-- [korgi](https://github.com/jodeci/korgi) - HTMLPipeline filters for links to Rails resources
-
 ## FAQ
 
 ### 1. Why doesn't my pipeline work when there's no root element in the document?