What's new since 0.5.0 beta 2?
- Fixed incompatibilities with Mercurial >= 4.4.
- Miscellaneous metadata format changes.
- Move more operations to the helper, hopefully making things faster.
- Updated git to 2.17.0 for the helper.
- Properly handle clones with bundles when the repository doesn't contain anything newer than the bundle.
- Fixed tag cache, which could lead to missing tags.