remove code course

Author: taylorotwell

readme.md

@@ -35,7 +35,6 @@ We would like to extend our thanks to the following sponsors for helping fund on
 - **[Tighten Co.](https://tighten.co)**
 - **[British Software Development](https://www.britishsoftware.co)**
 - **[Styde](https://styde.net)**
-- **[Codecourse](https://www.codecourse.com)**
 - [Fragrantica](https://www.fragrantica.com)
 - [SOFTonSOFA](https://softonsofa.com/)