Add ostr.io meta tag to test Ostrio's pre-rendering

Author: trusktr

index.html

@@ -6,6 +6,9 @@
 		<link rel="icon" href="./images/logo-icon.svg" />
 		<meta name="theme-color" content="#0043fa" />
 
+		<!-- Pre-rendering by https://ostr.io -->
+		<meta name="ostrio-domain" content="M3f2pdtligas0mtdBKNNYmvcgC0S8xZzgmmGwYe5IrB" />
+
 		<!-- Google Analytics -->
 		<script async src="https://www.googletagmanager.com/gtag/js?id=G-5B93FS5P5X"></script>
 		<script>