Release v1.4.0

To developers who take reference from this project to build another project (possibly written in different programming languages):
Despite LibJciHitachi being distributed under Apache 2.0 License, please contact us before open sourcing your project so that we can review the implementation details. Improper implementations may cause high loading on the Hitachi servers and thereby a stringent connection policy enforced.

Breaking Change: The minimally supported Python version is now 3.9.

What's Changed

• Add pre-commit hook by @qqaatw in #11
• Fix client ID and subscribed topics by @qqaatw in #15

Full Changelog: 1.3.0...1.4.0