minor updates in readme file

Author: amrlabib

readme.md

@@ -56,16 +56,16 @@ function MyTimer({ expiryTimestamp }) {
       <button onClick={resume}>Resume</button>
       <button onClick={() => {
         // Restarts to 5 minutes timer
-        var t = new Date();
+        const t = new Date();
         t.setSeconds(t.getSeconds() + 300);
         restart(t)
-      }}>restart</button>
+      }}>Restart</button>
     </div>
   );
 }
 
 export default function App() {
-  var t = new Date();
+  const t = new Date();
   t.setSeconds(t.getSeconds() + 600); // 10 minutes timer
   return (
     <div>