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.