Release Notes: 0.5.3

What's new since 0.5.2?

• Updated git to 2.25.0 for the helper.
• Fixed small memory leaks.
• Combinations of remote ref styles are now allowed.
• Added a git cinnabar unbundle command that allows to import a mercurial bundle.
• Experimental support for python >= 3.5.
• Fixed erroneous behavior of git cinnabar {hg2git,git2gh} with some forms of abbreviated SHA1s.
• Fixed handling of the GIT_SSH environment variable.
• Don't eliminate closed tips when they are the only head of a branch.
• Better handle manifests with double slashes created by hg convert from Mercurial < 2.0.1, and the following updates to those paths with normal Mercurial operations.
• Fix compatibility with Mercurial libraries >= 3.0, < 3.4.
• Windows helper is now statically linked against libcurl.