remove pub badges (#4251)

Author: pq

README.md

@@ -6,8 +6,6 @@ analysis server and the `dart analyze` command in the [Dart command-line tool][d
 [![Lint Count](https://dart-lang.github.io/linter/lints/count-badge.svg)](https://dart-lang.github.io/linter/lints/)
 [![Build Status](https://github.com/dart-lang/linter/workflows/linter/badge.svg)](https://github.com/dart-lang/linter/actions)
 [![Coverage Status](https://coveralls.io/repos/dart-lang/linter/badge.svg)](https://coveralls.io/r/dart-lang/linter)
-[![Pub](https://img.shields.io/pub/v/linter.svg)](https://pub.dev/packages/linter)
-[![package publisher](https://img.shields.io/pub/publisher/linter.svg)](https://pub.dev/packages/linter/publisher)
 [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/dart-lang/linter/badge)](https://deps.dev/project/github/dart-lang%2Flinter)
 
 ## Installing