[Feature Request] upperCaseSubject 默认值不要设置为false

[maicss]

💭 Describe the feature

项目的 commit message 和 GitHub issue 关联了，但是有自己的前缀，比如项目缩写叫 ABCD，所以 commit message 就是这样的 feat: ABCD-1234 删库跑路。这个时候想保持用户输入的内容，而不再 uppercase 或 lowercase。是要根据项目名称来的

💡 Proposed Solution

upperCaseSubject 不要设置为 false，判断用户没有输入的时候什么也不做，而不是 default false，再进行二元判断。
如果这个意见被采纳，我可以提 pr

[Zhengqbbb]

Thank you for pointing out the issue. 👍
I tried to cancel default upperCaseSubject automatic capitalization of the first letter.
And released a pre-release version ⭐ 1.12.0-beta.1 ⭐ to help test. If everything works fine, I will release a patch version as soon as possible. Thank you!

---

    /**
     * Subject is need upper case first.
     *
     * - `null`: Do not process
     * - `true`: Automatically capitalize the first letter
     * - `false`: Automatically lowercase the first letter
     * @default null
     */
    upperCaseSubject?: boolean | null

[Zhengqbbb]

The latest version 🌟(v1.12.0)🌟 should be resolve this issue request , please have a try. 💪
👀 Let me know if there are still any issues. 🎉