chore: Update copyright year

jcs090218 · jcs090218 · commit 5a4d63210acf · 2026-01-01T13:41:49.000+08:00
diff --git a/sideline-flycheck.el b/sideline-flycheck.el
@@ -1,6 +1,6 @@
 ;;; sideline-flycheck.el --- Show flycheck errors with sideline  -*- lexical-binding: t; -*-
 
-;; Copyright (C) 2022-2025  Shen, Jen-Chieh
+;; Copyright (C) 2022-2026  Shen, Jen-Chieh
 ;; Created date 2022-06-14 17:10:48
 
 ;; Author: Shen, Jen-Chieh <jcs090218@gmail.com>
