Fast implementation of Git in pure Go

Revert "README: Reachability bitmaps planned for the future"

This reverts commit 68ab022cf978fc1159cdcfb04c62cd57521be847.

runxiyu.tngl.sh 71dd999f 927752de

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README.md
··· 31 31 * Multi pack indexes 32 32 * Repack 33 33 * Writing thin packs 34 - * Reading reachability bitmaps 35 - * Writing reachability bitmaps when writing packfiles 36 34 * [commit-graph](https://git-scm.com/docs/commit-graph) (in progress) 37 35 * Network protocols 38 36 * Reftables