Merge pull request #151 from Ruudjhuu/Ruudjhuu-patch-1

Update README.md

Author: Ruudjhuu

README.md

@@ -34,5 +34,5 @@ build123d.export_step(part, "bin_2x1x3.step")
 ```
 
 # Credits
-@zackfreedman -- [gridfinity](https://youtu.be/ra_9zU-mnl8)
+@zackfreedman -- [gridfinity](https://youtu.be/ra_9zU-mnl8)  
 [grizzie17](https://www.printables.com/@grizzie17) -- [gridfinity-refined](https://www.printables.com/model/413761-gridfinity-refined)