Sopel-chanlogs

First release as `sopel-chanlogs`, replacing `sopel_modules.chanlogs`.

Changed:
* Modernize packaging, target Sopel 8.0+, take advantage of new Sopel API
features, and support only Python 3.8+

Meta:
* Fixed package metadata to credit the original author(s) and current
maintainer(s) correctly

Fixed:
* Switch from obsolete `clock.tz` setting to `core.default_timezone` (11)

Meta:
* Greatly improved documentation of settings (12)

Changed:
* Replaced deprecated call to `SopelMemory.contains()` (8)

Meta:
* Added project README file
* Use README as project's PyPI description

Changed:
* Target Sopel 7.x (5)

Added:
* Support for logging topic changes (3)
* Support for echo-message (4)

Fixed:
* Install errors (1)
* Startup/config glitches (2)

First release of `sopel_modules.chanlogs`.