Update README_template.md

Author: Arindam200

README_template.md

@@ -14,7 +14,7 @@ Steps on how to run the script along with suitable examples.
 
 ### Screenshot/GIF showing the sample use of the script
 <!--Remove the below lines and add yours -->
-Add a jpeg/png/gif file here.
+Add a jpg/jpeg/png/gif file here.
 
 ## *Author Name*
 <!--Remove the below lines and add yours -->