docs(README): Update CI badge URL to point to new workflow

Updated the CI badge in the README to use the correct URL for the
test workflow.

Author: seagle0128

README.md

@@ -1,6 +1,6 @@
 # lsp-pyright
 
-[![Build Status](https://github.com/emacs-lsp/lsp-pyright/workflows/CI/badge.svg?branch=master)](https://github.com/emacs-lsp/lsp-pyright/actions)
+[![CI](https://github.com/emacs-lsp/lsp-pyright/actions/workflows/test.yml/badge.svg)](https://github.com/emacs-lsp/lsp-pyright/actions/workflows/test.yml)
 [![License](http://img.shields.io/:License-GPL3-blue.svg)](License)
 [![MELPA](https://melpa.org/packages/lsp-pyright-badge.svg)](https://melpa.org/#/lsp-pyright)
 [![Join the chat at https://gitter.im/emacs-lsp/lsp-mode](https://badges.gitter.im/emacs-lsp/lsp-mode.svg)](https://gitter.im/emacs-lsp/lsp-mode?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)