readme: Fix typo.

Author: Yury Selivanov

README.md

@@ -14,7 +14,7 @@ from scratch for robustness with an extensive test suite.
 
 Type hints in comments require support by the color scheme.  The one
 used in the screenshot is
-[Chromodynamics](https://github.com/MagicStack/Chromodynamics).)
+[Chromodynamics](https://github.com/MagicStack/Chromodynamics).
 
 
 ## Installation Instructions