Handle versions with an underscore

[grahamgilbert]

Sometimes homebrew releases versions with an underscore in (like 2.52.0_1). This would previously break Carafe:

Error: Malformed version: 2.52.0_1
    Usage:
      carafe check [package] [flags]

    Flags:
      -h, --help                 help for check
          --min-version string   Minimum version to check the package against
          --munki-installcheck   Flag for munki installcheck which reverses the exit codes
          --skip-not-installed   Exits with success if the package is not installed. Must be used with --min-version flag. For use when checking to upgrade for security reasons

    Malformed version: 2.52.0_1