v6.0.0

What's Changed

• Align to Node.js by @yassernasc in https://github.com/holepunchto/bare-subprocess/pull/12

  exitCode is now null when the process is terminated by a signal and signal is now a string code, e.g. 'SIGABRT', rather than the corresponding numeric code, e.g. 6.

Full Changelog: https://github.com/holepunchto/bare-subprocess/compare/v5.2.3...v6.0.0