Release v0.72.0

• [Breaking] Enable React 17 new JSX transform (#848 by @danilobuerger)
• ‌[Breaking] Add watcher.additionalExts option, enable inclusion of .cjs and .mjs files by default (c1c6d9c)
• [Breaking] .json files will no longer be implicitly resolved if removed from resolver.sourceExts (a3dc30a)
• [Breaking] With a default config, any .jsx files will now be resolved before .json, .ts, .tsx (1b47931)
• [Breaking] Enable strict CLI validation when metro is passed an invalid subcommand or argument (19c4f7e)
• [Feature] Add start alias for serve CLI command (19c4f7e)

Full Changelog: v0.71.3...v0.72.0