- update to 0.20.23:
* Fix installation of GPG during package publishing.
* Prevent removal of refs directory when the last ref is
deleted.
* Fix filename: MERGE_HEADS => MERGE_HEAD.
* For ignored directories, porcelain.add and porcelain.status now only return
the path to directory itself in the list of ignored paths. Previously, paths
for all files within the directory would also be included in the list.
* Provide depth argument to ``determine_wants``.
* Various tag signature handling improvements.
* Add separate Tag.verify(). (Peter Rowlands)
* Add support for version 3 index files. (Jelmer Vernooij)
* Fix autocrlf=input handling. (Peter Rowlands, Boris Feld)
* Attempt to find C Git global config on Windows.
* The APIs for writing and reading individual index entries have changed
to handle lists of (name, entry) tuples rather than tuples.

* Add basic support for a GcsObjectStore that stores
pack files in gcs.
* In porcelain.push, default to local active branch.
* Support fetching symrefs.