build(deps-dev): bump batr from 2.1.5 to 2.1.6
build(deps-dev): bump batr from 2.1.5 to 2.1.6

Bumps [batr](https://github.com/eklem/batr) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/eklem/batr/releases)
- [Commits](https://github.com/eklem/batr/compare/v2.1.5...v2.1.6)

---
updated-dependencies:
- dependency-name: batr
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
eklem/stopword-trainer