add pinned arg to readme example

Author: Roald Ruiter

README.md

@@ -44,7 +44,7 @@ repos:
         # --reason: Add a reason to the error message in case of a non-matching version.
         # --pinned: Require the TwinCAT version to be pinned. Apply pinning if combined with --fix.
         # --no-pinned: Require the TwinCAT version to not be pinned. Remove pinning if combined with --fix.
-        args: [--target-version=3.1.4024.20, --fix, --reason="This version has a crucial new feature"]
+        args: [--target-version=3.1.4024.20, --pinned, --fix, --reason="This version has a crucial new feature"]
     # Optional, if you use pytmc to generate EPICS IOCs:
     # -   id: pytmc-pragma-linter
 ```