Update README.md

Author: aratheunseen

README.md

@@ -22,7 +22,7 @@ Step-2: Go to project root and execute the following command in console to get t
 - Flutter
 - Dart
 
-## Screens' Preview
+## Apps Screens
 ![daily-task-manager](https://user-images.githubusercontent.com/62181222/111222593-3f02b580-8606-11eb-89e1-c5c518f5ad96.jpg)