2.5.5

• python: do not add main brewed Python site-package to virtualenv (@iMichka)
• Fix running deprecated command in fish completion (@aktriver)
• Force brew upgrade to treat arguments as casks if --cask is passed. (@reitermarkus)
• Allow all cask options for brew reinstall and brew upgrade. (@reitermarkus)
• Bug fix _brew_upgrade zsh completion function (@lsparlin)