Update README with latest build instructions
Update README with latest build instructions

PiperOrigin-RevId: 346552295
Change-Id: Ie187c2da2e0ac5ba71d815fa1245706681f2d9c7

google/binexport,cblichmann/binexport,cblichmann/binexport,cblichmann/binexport,google/binexport,google/binexport