Log Message:
yarn: 1.16.0

1.16.0
Retries downloading a package on yarn install when we get a ETIMEDOUT error.
Implements yarn audit --level [severity] flag to filter the audit command's output.
Implements yarn audit --groups group_name [group_name ...].
Exposes the script environment variables to yarn create spawned processes.
Prevents EPIPE errors from being printed.
Adds support for the npm enterprise URLs when computing the offline mirror filenames.
Tweaks the lockfile parser logic to parse a few extra cases