Update epubcheck-ruby requirement from 5.1.0.0 to 5.2.0.0 (#70)
Updates the requirements on [epubcheck-ruby](https://github.com/takahashim/epubcheck-ruby) to permit the latest version.
- [Commits](https://github.com/takahashim/epubcheck-ruby/compare/v5.1.0.0...v5.2.0.0)
---
updated-dependencies:
- dependency-name: epubcheck-ruby
dependency-type: direct:production
...
Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
