Merge #1039: docs: add required style for commit messages

e17f03e docs: add required style for commit messages (Steve Myers)

Pull request description:

  ### Description

  Update CONTRIBUTING.md to specify that new commits should use 'Conventional Commits 1.0' style messages. See https://www.conventionalcommits.org/en/v1.0.0/.  I also fixed our current MSRV in the doc and fixed a spelling error.

  ### Notes to the reviewers

  I'm open to suggestions if anyone has another well documented style for commit messages.

  ### Changelog notice

  None.

  ### 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 `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  thunderbiscuit:
    ACK e17f03e. I've been using conventional commits for Padawan for over 2 years and think it's got good value, particularly on projects with bigger teams and number of contributors.
  danielabrozzoni:
    ACK e17f03e - I was hesitant at first, but I think this would make the commit messages cleaner (and in most cases even shorter). Going forward we should consider adding a CI check enforcing this.

Tree-SHA512: 5f4c42814e35e013ff7846110b2897a35720b8f4b8974f8c8004fc0f5161a10076cac62a7aa711c14295129999f93e238034972f28b77145c1917613f8856b03

Author: notmandatory

CONTRIBUTING.md

@@ -46,15 +46,15 @@ Every new feature should be covered by functional tests where possible.
 When refactoring, structure your PR to make it easy to review and don't
 hesitate to split it into multiple small, focused PRs.
 
-The Minimal Supported Rust Version is 1.46 (enforced by our CI).
+The Minimal Supported Rust Version is **1.57.0** (enforced by our CI).
 
 Commits should cover both the issue fixed and the solution's rationale.
-These [guidelines](https://chris.beams.io/posts/git-commit/) should be kept in mind.
+These [guidelines](https://chris.beams.io/posts/git-commit/) should be kept in mind. Commit messages should follow the ["Conventional Commits 1.0.0"](https://www.conventionalcommits.org/en/v1.0.0/) to make commit histories easier to read by humans and automated tools. 
 
 To facilitate communication with other contributors, the project is making use
 of GitHub's "assignee" field. First check that no one is assigned and then
 comment suggesting that you're working on it. If someone is already assigned,
-don't hesitate to ask if the assigned party or previous commenters are still
+don't hesitate to ask if the assigned party or previous commenter are still
 working on it if it has been awhile.
 
 Deprecation policy