Added financial contributors to the README (#115)

Author: monkeywithacupcake

README.md

@@ -1,4 +1,4 @@
-<a href="https://opencollective.com/substitute-js#section-contribute"><img src="https://opencollective.com/substitute-js/backers/badge.svg" alt="OpenCollective backers"></a> <a href="https://opencollective.com/substitute-js#section-contribute"><img src="https://opencollective.com/substitute-js/sponsors/badge.svg" alt="OpenCollective sponsors"></a>
+<a href="https://opencollective.com/substitute-js#section-contribute"><a href="https://opencollective.com/substitute-js" alt="Financial Contributors on Open Collective"><img src="https://opencollective.com/substitute-js/all/badge.svg?label=financial+contributors" /></a> 
 
 [`@fluffy-spoon/substitute`](https://www.npmjs.com/package/@fluffy-spoon/substitute) is a TypeScript port of [NSubstitute](http://nsubstitute.github.io), which aims to provide a much more fluent mocking opportunity for strong-typed languages.
 
@@ -238,3 +238,33 @@ However, it is only needed for your test projects anyway.
     }
 }
 ```
+
+## Contributors
+
+### Code Contributors
+
+This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
+<a href="https://github.com/ffMathy/FluffySpoon.JavaScript.Testing.Faking/graphs/contributors"><img src="https://opencollective.com/substitute-js/contributors.svg?width=890&button=false" /></a>
+
+### Financial Contributors
+
+Become a financial contributor and help us sustain our community. [[Contribute](https://opencollective.com/substitute-js/contribute)]
+
+#### Individuals
+
+<a href="https://opencollective.com/substitute-js"><img src="https://opencollective.com/substitute-js/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/substitute-js/contribute)]
+
+<a href="https://opencollective.com/substitute-js/organization/0/website"><img src="https://opencollective.com/substitute-js/organization/0/avatar.svg"></a>
+<a href="https://opencollective.com/substitute-js/organization/1/website"><img src="https://opencollective.com/substitute-js/organization/1/avatar.svg"></a>
+<a href="https://opencollective.com/substitute-js/organization/2/website"><img src="https://opencollective.com/substitute-js/organization/2/avatar.svg"></a>
+<a href="https://opencollective.com/substitute-js/organization/3/website"><img src="https://opencollective.com/substitute-js/organization/3/avatar.svg"></a>
+<a href="https://opencollective.com/substitute-js/organization/4/website"><img src="https://opencollective.com/substitute-js/organization/4/avatar.svg"></a>
+<a href="https://opencollective.com/substitute-js/organization/5/website"><img src="https://opencollective.com/substitute-js/organization/5/avatar.svg"></a>
+<a href="https://opencollective.com/substitute-js/organization/6/website"><img src="https://opencollective.com/substitute-js/organization/6/avatar.svg"></a>
+<a href="https://opencollective.com/substitute-js/organization/7/website"><img src="https://opencollective.com/substitute-js/organization/7/avatar.svg"></a>
+<a href="https://opencollective.com/substitute-js/organization/8/website"><img src="https://opencollective.com/substitute-js/organization/8/avatar.svg"></a>
+<a href="https://opencollective.com/substitute-js/organization/9/website"><img src="https://opencollective.com/substitute-js/organization/9/avatar.svg"></a>