v4.0.0-rc13

Implemented enhancements:

• Adding SSH ciphers when connecting #393
• Walking through tree of non gitignored files #307

Fixed bugs:

• No way to specify Auth for SubmoduleUpdateOptions #520
• panic when using custom SSH client #519
• Pack files >2GB create corrupted indexes #502
• Different behavior on Fetch and Pull #470
• git push new branch with depth=1 #455
• Upon repo.Push standard git still sees commits as unpushed #443
• Fetch remote tags to local #371
• Very slow for large repos #505

Merged pull requests:

• filesystem: reuse cache for packfile iterator #517 (smola)
• revlist: ignore all objects reachable from ignored objects #516 (smola)
• storage: reuse deltas from packfiles #515 (smola)
• cache: reuse object cache for delta resolution, use LRU policy #514 (smola)
• worktree: expose underlying filesystem #513 (mcuadros)
• format: idxfile, support for >2Gb packfiles #512 (mcuadros)
• remote: pull refactor to match default behavior of cgit #511 (mcuadros)
• packfile: create packfile.Index and reuse it #510 (smola)
• *: package context support in Repository, Remote and Submodule #509 (mcuadros)
• transport: context package support allowing cancellation of any network operation #507 (mcuadros)
• Add AuthMethod based on HTTP Authorization header #504 (strin)
• move Repository.Pull to Worktree.Pull #499 (mcuadros)
• remote: push, update remote refs on push #498 (mcuadros)
• Implement a NoTags mode for fetch that mimics git fetch --no-tags #496 (lupine)
• *: several windows support fixes #493 (mcuadros)
• packfile: Avoid panics patching corrupted deltas. #492 (ajnavarro)
• *: add more IO error checks #491 (smola)
• repository: allow push from shallow repositories #489 (mcuadros)
• worktree: checkout, create branch #487 (mcuadros)
• Add example code for listing tags #484 (orirawlings)