Update README.md

Author: nploi

README.md

@@ -21,6 +21,7 @@ import'package:flutter_verification_code_input/flutter_verification_code_input.d
   VerificationCodeInput(
       keyboardType: TextInputType.number,
       length: 4,
+      autofocus: true,
       onCompleted: (String value) {
         //...
         print(value);