Update index.html

Author: phenax

index.html

@@ -4,7 +4,7 @@
     <meta charSet="utf-8"/>
     <meta http-equiv="x-ua-compatible" content="ie=edge"/>
     <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"/>
-    <title>is-a.dev | Free domains for developers</title>
+    <title>is-a.dev | Free sub-domains for developers</title>
     <style>
       html, body {
         --header-bg: #0f0c19;