aria-expanded value not getting updated on openSubmenu and closeSubmenu callbacks. #106

Describe the bug
The Aria Expanded value is not getting updated when clicked on another menu items.

To Reproduce
Steps to reproduce the behavior:

1. Open the Navigation dropdown menu item.
2. Click on the sibling menu item.
3. The aria-expanded value remains unchanged and is not updated based on the openSubmenu and closeSubmenu callbacks.

Expected behavior
The aria-expanded value of the anchor element should be updated based on the openSubmenu and closeSubmenu callbacks

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Mobile (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Please list more relevant information here.