Updates README.md

Author: dipu-bd

README.md

@@ -1,12 +1,12 @@
 # cipherlib
 
 [![plugin version](https://img.shields.io/pub/v/cipherlib?label=pub)](https://pub.dev/packages/cipherlib)
+[![dart support](https://img.shields.io/badge/dart-%3e%3d%202.19.0-39f?logo=dart)](https://dart.dev/guides/whats-new)
 [![test](https://github.com/bitanon/cipherlib/actions/workflows/test.yml/badge.svg?branch=master)](https://github.com/bitanon/cipherlib/actions/workflows/test.yml)
 [![codecov](https://codecov.io/gh/bitanon/cipherlib/graph/badge.svg?token=ISIYJ8MNI0)](https://codecov.io/gh/bitanon/cipherlib)
 [![likes](https://img.shields.io/pub/likes/cipherlib?logo=dart)](https://pub.dev/packages/cipherlib/score)
 [![pub points](https://img.shields.io/pub/points/cipherlib?logo=dart&color=teal)](https://pub.dev/packages/cipherlib/score)
 [![popularity](https://img.shields.io/pub/popularity/cipherlib?logo=dart)](https://pub.dev/packages/cipherlib/score)
-[![dart support](https://img.shields.io/badge/dart-%3e%3d%202.14.0-39f?logo=dart)](https://dart.dev/guides/whats-new#september-8-2021-214-release)
 
 Implementations of cryptographic algorithms for encryption and decryption in Dart.