1.9.0

Added

• closeBtnLabel (driver and step level) to set the close button's
  aria-label, for translated tours. Defaults to Close.
  (#623)
• overlayClickBehavior: "none" to ignore overlay clicks while Escape and the
  close button still close the tour.
  (#435)

Changed

• Keyboard control follows the popover buttons: arrow keys do nothing when
  their button is hidden or disabled, and Escape does nothing when the close
  button is disabled.
  (#589)
• The current popover is hidden while waitForElement waits for the next
  step's element, so a stale step no longer stays on screen.
  (#578)
• Only one instance is on screen at a time. Starting a tour or highlight closes
  any other active instance; it gets onDeselected and onDestroyed but not
  onDestroyStarted.

Fixed

• destroy() on an instance that is not active is now a no-op instead of
  tearing down another instance's tour.
  (#504)
• The highlighted element's own aria-controls, aria-expanded and
  aria-haspopup are restored when the highlight moves on or the tour ends,
  instead of being removed.
  (#495)
• No more small white square between steps without an element.
  (#549)
• onDeselected now fires when moving between two steps on the same element,
  or between two steps without an element.
• The driver-level disableButtons now applies to tour steps. It used to be
  ignored during a tour. A step's own disableButtons still replaces it.