chore: index.html [skip ci]

Author: hoiheart

demo/index.html

@@ -4,6 +4,10 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Vue Diff</title>
+  <meta name="description" content="VueJS diff viewer plugin" />
+  <og:title>Vue Diff</og:title>
+  <og:description>VueJS diff viewer plugin</og:description>
+  <meta name="keywords" content="Vue diff, VueJS diff, Vue diff plugin, VueJS diff plugin, Vue diff viewer, VueJS diff viewer, diff viewer" />
   <link href="https://unpkg.com/tailwindcss@^2/dist/tailwind.min.css" rel="stylesheet">
   <meta name="google-site-verification" content="u7XrdGhKnDkPIIw867fVSCqMet0sjBwyu5aYpy8stuQ" />
 <script type="module" crossorigin src="/vue-diff/demo/index.a359d696.js"></script>