9.0.0-beta8

See last link for the details about the following highlights:

• Add security-updates command. A Composer equivalent for old --security-only option.(#3087)
• Better coding standards compliance for 'generate' command
• Better discovery of global commandfiles #3052
• Config for sql-sync options now properly proceessed #3075
• Check requirements before running updatedb #2708
• Control when post-updates are run during updatedb. (#3090)
• Misc bug fixes
• Changes since 9.0.0-beta7.