Merge bitcoindevkit/bdk-cli#306: Bump version to 4.0.0

Merge bitcoindevkit/bdk-cli#306: Bump version to 4.0.0

0f04e94331637b66227e4bb6ea93044ad13a5bde Bump version to 4.0.0 (Vihiga Tyonum)

Pull request description:

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  ### Description

  This PR bumps the CLI version to 4.0.0

  ## Changelog notice

  - Bumps project version to 4.0.0

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk-cli/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

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