Update README.md

[sakata1222]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the README to revise the Codecov badge URL, ensuring it reflects the intended link format.

• Removed the branch-specific segment from the Codecov badge URL
• Updated the badge link in the README

Comments suppressed due to low confidence (1)

README.md:6

• Verify that the new Codecov badge URL meets the project's intended reporting requirements, as removing the branch-specific reference could lead to unexpected behavior if multiple branches are in use.

[![codecov](https://codecov.io/gh/sakata1222/jacoco-markdown-gradle-plugin/graph/badge.svg)](https://codecov.io/gh/sakata1222/jacoco-markdown-gradle-plugin)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.00%. Comparing base (e5794e1) to head (6b3d3b0).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #93   +/-   ##
=========================================
  Coverage     97.00%   97.00%           
  Complexity      277      277           
=========================================
  Files            41       41           
  Lines           667      667           
  Branches         17       17           
=========================================
  Hits            647      647           
  Misses           20       20           

Flag	Coverage Δ
unittests	97.00% <ø> (ø)

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