Merge bitcoindevkit#341: Update README with new codecov badge

24cf4a9 chore: update README with codecov badge (Steve Myers)

Pull request description:

  ### Description

  Now that bitcoindevkit#327 is merged and running we need to update the README badge.

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `just p` before pushing

Top commit has no ACKs.

Tree-SHA512: f311f5c85230b1c3c23650ed518c7b330773bb096fd0e3c24d9223c14cc2a6bcecfb2eb7ab09546be7515414d62e52d24ac4e3cfc5282d89554ac055cd0f753d

Author: notmandatory

README.md

@@ -11,7 +11,7 @@
     <a href="https://crates.io/crates/bdk_wallet"><img alt="Crate Info" src="https://img.shields.io/crates/v/bdk_wallet.svg"/></a>
     <a href="https://github.com/bitcoindevkit/bdk/blob/master/LICENSE"><img alt="MIT or Apache-2.0 Licensed" src="https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg"/></a>
     <a href="https://github.com/bitcoindevkit/bdk/actions?query=workflow%3ACI"><img alt="CI Status" src="https://github.com/bitcoindevkit/bdk/workflows/CI/badge.svg"></a>
-    <a href="https://coveralls.io/github/bitcoindevkit/bdk?branch=master"><img src="https://coveralls.io/repos/github/bitcoindevkit/bdk/badge.svg?branch=master"/></a>
+    <a href="https://codecov.io/github/bitcoindevkit/bdk_wallet" ><img src="https://codecov.io/github/bitcoindevkit/bdk_wallet/graph/badge.svg"/></a>
     <a href="https://docs.rs/bdk_wallet"><img alt="API Docs" src="https://img.shields.io/badge/docs.rs-bdk_wallet-green"/></a>
     <a href="https://blog.rust-lang.org/2025/02/20/Rust-1.85.0/"><img alt="Rustc Version 1.85.0+" src="https://img.shields.io/badge/rustc-1.85.0%2B-lightgrey.svg"/></a>
     <a href="https://discord.gg/d7NkDKm"><img alt="Chat on Discord" src="https://img.shields.io/discord/753336465005608961?logo=discord"></a>