Activating Open Collective (#526)

* Added financial contributors to the README

* Update README.md

* Moved Financial Contributors to the end of the badges.

README.md

@@ -3,6 +3,7 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/u6u9tn7rk5tln33s/branch/master?svg=true)](https://ci.appveyor.com/project/jekyll/jekyll-admin)
 [![Coverage Status](https://coveralls.io/repos/github/jekyll/jekyll-admin/badge.svg?branch=master)](https://coveralls.io/github/jekyll/jekyll-admin?branch=master)
 [![NPM Dependencies](https://david-dm.org/jekyll/jekyll-admin.svg)](https://david-dm.org/jekyll/jekyll-admin)
+[![Financial Contributors on Open Collective](https://opencollective.com/jekyll-admin/all/badge.svg?label=financial+contributors)](https://opencollective.com/jekyll-admin)
 
 A Jekyll plugin that provides users with a traditional CMS-style graphical interface to author content and administer Jekyll sites. The project is divided into two parts. A Ruby-based HTTP API that handles Jekyll and filesystem operations, and a JavaScript-based front end, built on that API.
 
@@ -45,6 +46,36 @@ jekyll_admin:
 
 Interested in contributing to Jekyll Admin? We’d love your help. Jekyll Admin is an open source project, built one contribution at a time by users like you. See [the contributing instructions](.github/CONTRIBUTING.md), and [the development docs](https://jekyll.github.io/jekyll-admin/development/) for more information.
 
+## Contributors
+
+### Code Contributors
+
+This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
+<a href="https://github.com/jekyll/jekyll-admin/graphs/contributors"><img src="https://opencollective.com/jekyll-admin/contributors.svg?width=890&button=false" /></a>
+
+### Financial Contributors
+
+Become a financial contributor and help us sustain our community. [[Contribute](https://opencollective.com/jekyll-admin/contribute)]
+
+#### Individuals
+
+<a href="https://opencollective.com/jekyll-admin"><img src="https://opencollective.com/jekyll-admin/individuals.svg?width=890"></a>
+
+#### Organizations
+
+Support this project with your organization. Your logo will show up here with a link to your website. [[Contribute](https://opencollective.com/jekyll-admin/contribute)]
+
+<a href="https://opencollective.com/jekyll-admin/organization/0/website"><img src="https://opencollective.com/jekyll-admin/organization/0/avatar.svg"></a>
+<a href="https://opencollective.com/jekyll-admin/organization/1/website"><img src="https://opencollective.com/jekyll-admin/organization/1/avatar.svg"></a>
+<a href="https://opencollective.com/jekyll-admin/organization/2/website"><img src="https://opencollective.com/jekyll-admin/organization/2/avatar.svg"></a>
+<a href="https://opencollective.com/jekyll-admin/organization/3/website"><img src="https://opencollective.com/jekyll-admin/organization/3/avatar.svg"></a>
+<a href="https://opencollective.com/jekyll-admin/organization/4/website"><img src="https://opencollective.com/jekyll-admin/organization/4/avatar.svg"></a>
+<a href="https://opencollective.com/jekyll-admin/organization/5/website"><img src="https://opencollective.com/jekyll-admin/organization/5/avatar.svg"></a>
+<a href="https://opencollective.com/jekyll-admin/organization/6/website"><img src="https://opencollective.com/jekyll-admin/organization/6/avatar.svg"></a>
+<a href="https://opencollective.com/jekyll-admin/organization/7/website"><img src="https://opencollective.com/jekyll-admin/organization/7/avatar.svg"></a>
+<a href="https://opencollective.com/jekyll-admin/organization/8/website"><img src="https://opencollective.com/jekyll-admin/organization/8/avatar.svg"></a>
+<a href="https://opencollective.com/jekyll-admin/organization/9/website"><img src="https://opencollective.com/jekyll-admin/organization/9/avatar.svg"></a>
+
 ## License
 
 The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).