Update readme.md

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

readme.md

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 - [Games of Coding](https://github.com/michelpereira/awesome-games-of-coding#readme) - Learn a programming language by making games.
 - [Esports](https://github.com/strift/awesome-esports#readme) - Video games played as a sport.
 - [Learn Gamedev](https://github.com/notpresident35/awesome-learn-gamedev#readme) - The craft of video game creation.
-- [Game Engine Development](https://github.com/stevinz/awesome-game-engine-dev#readme) - Building software to speed game creation.
+- [Game Engine Development](https://github.com/stevinz/awesome-game-engine-dev#readme) - Building software to speed up game creation.
 
 ## Development Environment