Update rake-manifest requirement from ~> 0.1.0 to ~> 0.2.0
Update rake-manifest requirement from ~> 0.1.0 to ~> 0.2.0

Updates the requirements on [rake-manifest](https://github.com/mvz/rake-manifest) to permit the latest version.
- [Release notes](https://github.com/mvz/rake-manifest/releases)
- [Changelog](https://github.com/mvz/rake-manifest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mvz/rake-manifest/compare/v0.1.0...v0.2.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
mvz/gir_ffi-cairo