feat: add theme version in footer

Author: reco_luan

components/Footer.vue

@@ -2,7 +2,7 @@
   <div class="footer-wrapper">
     <span>
       <i class="iconfont reco-theme"></i>
-      <a target="blank" href="https://vuepress-theme-reco.recoluan.com">VuePress-theme-reco</a>
+      <a target="blank" href="https://vuepress-theme-reco.recoluan.com">{{`vuepress-theme-reco@${version}`}}</a>
     </span>
     <span v-if="$themeConfig.record">
       <i class="iconfont reco-beian"></i>
@@ -29,7 +29,13 @@
 </template>
 
 <script>
+import { version } from '../package.json'
 export default {
+  data () {
+    return {
+      version
+    }
+  },
   computed: {
     year () {
       return new Date().getFullYear()