Fix url for 0438

Author: extesy

README.md

@@ -52,7 +52,7 @@ the direction the language is evolving in.
 * [0385-module-system-cleanup.md](text/0385-module-system-cleanup.md)
 * [0401-coercions.md](text/0401-coercions.md)
 * [0430-finalizing-naming-conventions.md](text/0430-finalizing-naming-conventions.md)
-* [0438-precedence-of-plus.md](0438-precedence-of-plus.md)
+* [0438-precedence-of-plus.md](text/0438-precedence-of-plus.md)
 * [0463-future-proof-literal-suffixes.md](text/0463-future-proof-literal-suffixes.md)
 
 ## Table of Contents