`changelog.rst` is difficult to find

Can you please link to https://github.com/dbcli/pgcli/blob/main/changelog.rst (or perhaps a tagged latest-release version) from pypi (by adding a setting to `pyproject.toml`) and https://www.pgcli.com/docs so that we can see what goodies we're getting this time.

从 pyproject.toml 和 https://www.pgcli.com/docs 上的文档开始。检查 PyPI 项目链接和文档导航的配置方式，然后在这两个位置都添加指向 changelog.rst 或最新版本 changelog 的易发现链接，并验证这些链接能够正确解析。

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