Update README.md

Author: mianzaid

README.md

@@ -72,7 +72,7 @@ A PHP base class that you can use to upload any file into the server. It is a ve
 |   Parameters         |   Default Value   |   Description |
 |----------------------|-------------------|---------------|
 |   Response format    |   array           |   You can set it to JSON or array.    |
-|   Allow extensions   |   Not set         |   You can set the file extensions in the array.    |
+|   Allow extensions   |   Not set         |   You can set the file extensions in the array like ['jpg','PNG'].    |
 |   Dir path           |   false           |   Folder name where you need to save images [‘../Upload/’]. If you set the thumbs size array, the thumb folder will be created and thumb files move there. |
 |   Dir permission     |   0655            |   You can set the permission of the newly created Dir.   |