v4.2.1

Changes

Merged pull requests:

• Add commit hash to blame result #795 (shanedasilva)
• *: Use CheckClose with named returns and fix tests #794 (jfontan)
• Resolve HEAD if symRefs capability is not supported #792 (ajnavarro)
• *: skip time consuming tests #786 (mcuadros)
• Fix RefSpec.Src() #783 (maguro)
• Worktree.Checkout: handling of symlink on Windows #778 (fkollmann)
• plumbing: format: pktline, Accept oversized pkt-lines up to 65524 bytes #797 (jvusich)