updated readme

Author: nj-coder

README.md

@@ -1,6 +1,6 @@
 # NJ-TimePicker
 <p align="center">
-  <img src="http://nj-coder.com/nj-libs/nj-timepicker/images/screen-shot.png">
+  <img src="https://nj-coder.com/nj-libs/nj-timepicker/images/nj-picker.png">
 </p>
 
 NJ-TimePicker is a pure JavaScript based timepicker that enables you to select time both in 12-hour and 24-hour format in a web and mobile friendly user interface. Checkout the [DEMO HERE](http://nj-coder.com/nj-libs/nj-timepicker/index.html) or [FIDDLE IT OUT](https://jsfiddle.net/nidhingeorgejoseph/5dc0trb9/)