Don't autocomplete username

index.html

@@ -14,7 +14,7 @@
       <h1>⚡️ tippin.me Badge Generator</h1>
       <p class="description">Enter your Twitter username</p>
       <div class="input-container">
-        <input type="text" name="username" placeholder="username" autofocus>
+        <input type="text" name="username" placeholder="username" autofocus autocomplete="off">
         <span class="prefix">@</span>
       </div>
       <div class="badge-preview"></div>