4.0 | Wiki/Upgrade guides: remove warning about 4.0 not having been released + update branch rename info#36

jrfnl wants to merge 2 commits intomainPHPCSStandards/PHP_CodeSniffer-documentation:mainfrom

wiki/phpcs-4.0/upgrade-guides-remove-warningPHPCSStandards/PHP_CodeSniffer-documentation:wiki/phpcs-4.0/upgrade-guides-remove-warningCopy head branch name to clipboard