Update README.md

Author: ffMathy

README.md

@@ -1,5 +1,7 @@
 [`@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.
 
+*You can read an in-depth comparison of `substitute.js` versus other popular TypeScript mocking frameworks here: https://medium.com/@mathiaslykkegaardlorenzen/with-typescript-3-and-substitute-js-you-are-already-missing-out-when-mocking-or-faking-a3b3240c4607*
+
 # Installing
 `npm install @fluffy-spoon/substitute --save-dev`