Move default max zoom 16 to a constants module (#389)

* Move max zoom 16 to a constants module
* bump version to v2.5.0

---------

Co-authored-by: Nathaniel Kelso <nvkelso@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Make buffer_cfg work for meta tile build (#401)

Merge pull request #381 from tilezen/zerebubuth/v2.4.0-changelog

Update changelog for v2.4 release.

Merge pull request #369 from tilezen/zerebubuth/update-for-v2.3

Update changelog and version file, bump to v2.3.0.

Update CHANGELOG.md

Merge pull request #361 from tilezen/nvkelso/v2.2-changelog

v2.2 changelog

Merge pull request #351 from tilezen/zerebubuth/changelog-for-v2.1.0

Add changelog and bump version to v2.1.0.