update link of http to https

Author: jyootai

src/public/index.html

@@ -47,7 +47,7 @@ <h4>Routes</h4>
       <h4>Documentation</h4>
       <p>
         View
-        <a href="http://github.com/typicode/json-server">README</a>
+        <a href="https://github.com/typicode/json-server">README</a>
         on GitHub.
       </p>