Clear cache on relaod

history.html

@@ -13,6 +13,7 @@
   <main class="history-page">
     <header>
       <h1><img class="brand-logo" src="logo.png" alt="Splirate"></h1>
+      <button id="clearHistoryBtn" type="button">Clear</button>
     </header>
     <p id="status">Loading history...</p>
     <ul id="historyList"></ul>