v4.0.0-rc5

Public API:

• remote: make Fetch atomic. (#185)
• remote: sideband support (#164)
• move plumbing from top level package to plumbing (#183)
• repository: Ref -> Reference; Refs -> References. (#168)
• file: return error on File.Contents() if reader fails (#150)
• rev-list command implementation for objects (#135)
• difftree: merkletrie internal package with iterator (#133)

Config:

• bare flag (#177)
• support delete refspecs (IsDelete). (#166)

Storage:

• filesystem, clean close when the packfile is not used (#140)
• shallow storage (#180)

Protocols:

• packp: add report status message. (#162)
• packp: add reference update request encoder. (#147)
• packp: add upload pack response message (#161)
• capabilities: implementation (#144, #151, #153, #170)
• sideband: muxer and demuxer (#143)

Formats:

• packfile: packfile write (#131)
• packfile: delta calculation (#182, #186, #172, #159)
• pktline: fix readPayloadLen err handling (#148)

Utils:

• fs: memory fix read offset
• fs: memory fix ReadDir, error getting filename

Transports:

• http: Add configurable http client factory (fixes #120) (#121)
• git: new git protocol (#175)
• ssh: keeping the original path (#189)
• local/ssh: add git-send-pack support (#163)
• local: add local transport (#145)
• create Client interface (#132)