preload cover image

Author: chrisminnick

reactjsfoundations.com/public/index.html

@@ -62,6 +62,7 @@
       href="%PUBLIC_URL%/favicon-16x16.png"
     />
     <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <link rel="preload" as="image" href="/images/cover.jpg" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="theme-color" content="#000000" />
     <script