Update README

Author: manavgabhawala

README.md

@@ -3,10 +3,10 @@ MHacks for iOS and  Watch
 
 This is the public repo for the MHacks iOS app. If you're developing an app for a hackathon at your school, feel free to take inspiration from ours. Please credit us if you copy pieces of our source code.
 
-![Countdown](Screenshots/4.0/4.7-Inch/3.png)
-![Schedule](Screenshots/4.0/4.7-Inch/1.png)
-![Announcements](Screenshots/4.0/4.7-Inch/4.png)
-![Maps](Screenshots/4.0/4.7-Inch/2.png)
-![Ticket](Screenshots/4.0/4.7-Inch/5.png)
+![Countdown](Screenshots/4.0/4.7-Inch/3.jpg)
+![Schedule](Screenshots/4.0/4.7-Inch/1.jpg)
+![Announcements](Screenshots/4.0/4.7-Inch/4.jpg)
+![Maps](Screenshots/4.0/4.7-Inch/2.jpg)
+![Ticket](Screenshots/4.0/4.7-Inch/5.jpg)
 ![Watch](Screenshots/4.0/Apple-Watch/1.jpg)
 ![Complication](Screenshots/4.0/Apple-Watch/2.jpg)