v4.0.0-rc12

Implemented enhancements:

• transport: push with HTTPS : receive-pack not supported yet #406

Fixed bugs:

• Push: RefSpec deleting reference does not work #466
• data races in plumbing/transport/internal/common #463
• Git status silently fails in a repository with no commits. #459
• capabilities parsing fails when non-standard capability is found (was: Cloning from github broken?) #450
• Chroot boundary crossed error when cloning symlinks pointing outside the repo #445
• submodules path in gitdir is wrong (was: Submodules not having any objects) #413
• References() returns forward slashes on Windows #372
• Fetch remote tags to local #371
• Race detected during PlainClone #351
• Reference IsTag() is broken #461

Improvements

• remote: fix Worktree.Status on empty repository #480 (mcuadros)
• remote: avoid duplicate haves #479 (mcuadros)
• worktree: test improvemnts on empty worktree #478 (mcuadros)
• git: remove ErrObjectNotFound in favor of plumbing.ErrObjectNotFound #477 (taralx)
• transport/server: add asClient parameter #476 (smola)
• plumbing: protocol, fix handling multiple ACK on upload-pack and test… #475 (mcuadros)
• Use buffered IO for decoding index files. #473 (taralx)
• improve delete support on push #472 (smola)
• plumbing: protocol, fix handling multiple ACK on upload-pack #469 (mcuadros)
• remote: fix push delete, closes #466 #467 (smola)
• fix reference shortening #465 (smola)
• transport/file: avoid race with Command.Wait, fixes #463 #464 (smola)
• fix race on packfile writer, fixes #351 #453 (smola)
• storage/filesystem: Fix nil dereference in Shallow() #452 (taralx)
• capability: accept unknown capabilities, fixes #450 #451 (smola)
• transport: http push #432 (ajnavarro)
• transport/ssh: allow passing SSH options #423 (smola)
• Fixed modules directory path #414 (Cromel)
• remote: fetch, correct behavior on tags #485 (mcuadros)