Update README.md

Fixed spelling error

Clickteam Fustion -> Clickteam Fusion

README.md

@@ -43,7 +43,7 @@
 - [Heaps](https://heaps.io/) - Mature cross platform graphics engine designed for high performance games.
 - [Game Maker Studio](https://www.yoyogames.com/gamemaker) - GameMaker Studio 2 is the latest and greatest incarnation of GameMaker.
 - [Pixelbox.js](https://pixwlk.itch.io/pixelbox) - Lightweight Javascript engine for browser games.
-- [Clickteam Fustion](https://www.clickteam.com/clickteam-fusion-2-5-free-edition) - Easy to use game engine for beginners.
+- [Clickteam Fusion](https://www.clickteam.com/clickteam-fusion-2-5-free-edition) - Easy to use game engine for beginners.
 - [Construct 3D](https://www.construct.net/en) - Powerful Javascript based engine with visual coding editor and more!
 - [gbdk-2020](https://github.com/gbdk-2020/gbdk-2020) - A C compiler, assembler, linker and set of libraries for the Z80 like Nintendo Gameboy.