docs: update README badges and image link

Author: kyle-seongwoo-jun

README.md

@@ -1,13 +1,13 @@
 # timezone_to_country
 
-[![pub package](https://img.shields.io/pub/v/timezone_to_country.svg)](https://pub.dev/packages/timezone_to_country)
-[![pub points](https://img.shields.io/pub/points/timezone_to_country?color=2E8B57&label=pub%20points)](https://pub.dev/packages/timezone_to_country/score)
-[![pub downloads](https://img.shields.io/pub/dm/timezone_to_country)](https://pub.dev/packages/timezone_to_country/score)
+[![pub package](https://badgen.net/pub/v/timezone_to_country)](https://pub.dev/packages/timezone_to_country)
+[![pub points](https://badgen.net/pub/points/timezone_to_country)](https://pub.dev/packages/timezone_to_country/score)
+[![pub downloads](https://badgen.net/pub/dm/timezone_to_country)](https://pub.dev/packages/timezone_to_country/score)
 [![device_info_plus](https://github.com/kyle-seongwoo-jun/flutter_timezone_to_country/actions/workflows/flutter.yml/badge.svg)](https://github.com/kyle-seongwoo-jun/flutter_timezone_to_country/actions/workflows/flutter.yml)
 
 Library for translation Time Zone Id to ISO 3166-1 alpha-2 code (e.g. `'Asia/Seoul'` to `'KR'`)
 
-![example](https://raw.githubusercontent.com/kyle-seongwoo-jun/flutter_timezone_to_country/master/images/example.png)
+![example](https://raw.githubusercontent.com/kyle-seongwoo-jun/flutter_timezone_to_country/main/images/example.png)
 
 ## Usage