Merge pull request #49 from RayZhao1998/feature/version

fix: change years

Author: villivateur

src/App.vue

@@ -11,7 +11,7 @@
         <a v-on:click="gotoabout">关于</a>
       </div>
       <div style="text-align: center; margin: 2px 0px 10px">
-        <p>&copy; <a href="https://a2os.club" style="color: #2c3e50;">A²OS</a> 2018-2019 All rights reserved.</p>
+        <p>&copy; <a href="https://a2os.club" style="color: #2c3e50;">A²OS</a> 2018-2020 All rights reserved.</p>
       </div>
     </div>
   </div>