Merge #308: chore: bump dev version to 3.0.0-alpha.0

5492e13 chore: bump dev version to 3.0.0-alpha.0 (valued mammal)

Pull request description:

  PR updates the master dev version to 3.0.0-alpha.0.

  fix #304

  ### 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)

ACKs for top commit:
  thunderbiscuit:
    ACK 5492e13.

Tree-SHA512: f404ca3de30cf76050a26db526f440f7c17f0dc816fdc96d60b8358dcbfcb9f1fce65cdeef736c91ce449808805acf5bb45e8b0769e7c1837f0097e4ddbfa4fc

Author: ValuedMammal

wallet/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "bdk_wallet"
 homepage = "https://bitcoindevkit.org"
-version = "2.1.0"
+version = "3.0.0-alpha.0"
 repository = "https://github.com/bitcoindevkit/bdk_wallet"
 documentation = "https://docs.rs/bdk_wallet"
 description = "A modern, lightweight, descriptor-based wallet library"