There is a new minor release, pygit2 0.21.2 at https://pypi.python.org/pypi/pygit2/0.21.2 The most important change is the fix of a regression introduced in 0.21.0, see https://github.com/libgit2/pygit2/commit/3ccba387258ed9aea68d8b6a2714c954ed43319c
Added to the tree.