Dynamic change copyright year (#194)

* Dynamic change copyright year

* Fix test

Author: Hung Nguyen

packages/iotex-react-footer/src/footer.tsx

@@ -143,7 +143,7 @@ export function Footer(): JSX.Element {
       </Align>
       <FooterBottom>
         <span>
-          <span>© {new Date().getFullYear()} IoTeX</span>
+          <span>© {`${new Date().getFullYear()}`} IoTeX</span>
           <Team href={"https://iotex.io/policy"}>{t("footer.policy")}</Team>
         </span>
       </FooterBottom>