update changelog

CHANGELOG.md

@@ -1,6 +1,10 @@
 ## [4.0.0-rc01] - 2024-01-28
 
 ### Breaking
+- exit with a different code when linter is configured incorrectly (255) vs
+  when errors are found in linted files (1) https://github.com/solhint-community/solhint-community/pull/134
+    - also exit eagerly when a misconfiguration is detected, to help the programmer
+    realize of their mistake sooner
 - removed `no-unused-import`, is now a special case of `no-unused-vars` https://github.com/solhint-community/solhint-community/pull/22
 - removed `contract-name-camelcase`, which checked event, struct, enum and
   contract names were in CapWords. moved that functionality into new rule