Merge bitcoindevkit/bdk-cli#265: Bump version to 3.0.0

Merge bitcoindevkit/bdk-cli#265: Bump version to 3.0.0

07fd32f8a70bc24463e58c8ffd63fbcaae9930f2 Bump version to 3.0.0 (Vihiga Tyonum)
83499d70ea137c69aea47389de6da20cfc3cddd4 docs: Update changelog for v3.0.0 release (Vihiga Tyonum)

Pull request description:

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  ### Description

  This PR bumps the crate version to 3.0.0

  Closes #257

  <!-- Describe the purpose of this PR, what's being adding and/or fixed -->

  ### 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

ACKs for top commit:
  va-an:
    ACK 07fd32f8a70bc24463e58c8ffd63fbcaae9930f2

Tree-SHA512: 60c753c7637749971fd695cfce08a9a0abac5b2ea3ed470a6d42cfb8f4861f35fee510af174956d213fb3cde8cc4a907a9fc309d23bf42befd909deadfd1aa22