Update README.md

Author: ffMathy

README.md

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-<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> 
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 First some shameless promotion for my other project: **I'm currently building the GitHub app [Pull Dog](https://dogger.io)**, which creates a Docker-based test environment for every pull request you open, and send a link to the environment right in the pull request itself, as a comment.
 
+<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> 
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 # What is this?
 [`@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.