Match copyright year with LICENSE

Author: ken-matsui

app/_components/footer.tsx

@@ -5,7 +5,7 @@ export function Footer() {
         <footer className="container mx-auto max-w-7xl pb-12 px-12">
             <div className="flex flex-col justify-center items-center gap-1">
                 <p className="text-sm text-default-400">
-                    © {new Date().getFullYear()}{" "}
+                    © 2018-{new Date().getFullYear()}{" "}
                     <Link
                         isExternal
                         aria-label="Ken Matsui"