use timer demo minor update in restart and readme updates

Author: amrlabib

demo/components/UseTimerDemo.js

@@ -28,7 +28,7 @@ export default function UseTimerDemo({ expiryTimestamp }: Object) {
           // Restarts to 10 minutes timer
           const time = new Date();
           time.setSeconds(time.getSeconds() + 600);
-          restart(time);
+          restart(time, true);
         }}
       >
         Restart

readme.md

@@ -89,7 +89,7 @@ export default function App() {
 | pause | function | function to be called to pause timer |
 | start | function | function if called after pause the timer will continue based on original expiryTimestamp |
 | resume | function | function if called after pause the timer will continue countdown from last paused state |
-| restart | function | function to restart timer with new expiryTimestamp |
+| restart | function | function to restart timer with new expiryTimestamp, accept 2 arguments first is the new `expiryTimestamp` of type number(timestamp) and second is `autoStart` of type boolean to decide if it should automatically start after restart or not |
 
 
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