Fix typo

Author: wooorm

readme.md

@@ -131,7 +131,7 @@ abide by its terms.
 
 [collective]: https://opencollective.com/unified
 
-[chat-badge]: https://img.shields.io/badge/jchat-spectrum-7b16ff.svg
+[chat-badge]: https://img.shields.io/badge/chat-spectrum-7b16ff.svg
 
 [chat]: https://spectrum.chat/unified/syntax-tree