README

Update binaries:

1. Download archives pre-compiled binaries. 2. Unzip archives. 3. Re-zip just the binary: `zip new.zip node-v10.14.1-linux-x64/bin/node` 4. Use the update script: `./dependency_manager/bin/update --config common/node_runner/node_runner/node_binaries.json --dependency node --path new.zip --platform linux_x86_64` 5. Mail out the automated change to `node_binaries.json` for review and CQ.