Demerge

This release only fixed a wrong version written in `pyproject.toml`.

What's Changed
* Fix package version written in pyproject.toml by astropenguin in https://github.com/deshima-dev/dmerge/pull/19


**Full Changelog**: https://github.com/deshima-dev/dmerge/compare/v2.1.0...v2.1.1

In this release, merge scripts are bundled into a Python package `dmerge`. Each former script (e.g. `merge_to_dems.py`) is now available as a shell command (`merge_to_dems`). You need to locally install the `dmerge` package prior to using the commands (see `README.md` for more details). Note that the merge functionality has not been changed.

What's Changed
* Bundle merge scripts into a single package by astropenguin in https://github.com/deshima-dev/dmerge/pull/17


**Full Changelog**: https://github.com/deshima-dev/dmerge/compare/v2.0.2...v2.1.0

In this release, unused files (mostly related to DFITS and docs) were removed, but the functionality was unchanged.

What's Changed
* Remove unused files by astropenguin in https://github.com/deshima-dev/dmerge/pull/15


**Full Changelog**: https://github.com/deshima-dev/dmerge/compare/v2.0.1...v2.0.2

This release only focused on refactoring. All updates did not change the functionality.

What's Changed
* Format Python codes by Black by astropenguin in https://github.com/ttakekoshi/dmerge/pull/13

New Contributors
* astropenguin made their first contribution in https://github.com/ttakekoshi/dmerge/pull/13

**Full Changelog**: https://github.com/ttakekoshi/dmerge/compare/v2.0.0...v2.0.1

Release second version compatible with DEMS format

**Full Changelog**: https://github.com/ttakekoshi/dmerge/compare/v1.0.0...v2.0.0

Release first version

**Full Changelog**: https://github.com/ttakekoshi/dmerge/commits/v1.0.0