v1.2.0 Release | Vue Storefront 2 for PrestaShop

# v1.2.0 Release

[Feature] Added shipping price to delivery option and cart preview Issue #79 (opens new window)
[Feature] Added Czech language PR #78 (opens new window)
[Feature] Added sub menu support to both desktop and mobile menus #84 (opens new window)
[Feature] Handling cart errors, check for product availability PR #85 (opens new window)
[Feature] Disables add to cart button when the item is not available #86 (opens new window)
[Feature] Stop adding out-of-stock product PR #88 (opens new window)

[Fix] Language selector is showing on a mobile version in single language Issue #76 (opens new window)
[Fix] Carrier is not selected correctly in checkout step Issue #70 (opens new window)
[Fix] The total and subtotal prices in the checkout steps are incorrect #67 (opens new window)
[Fix] app.i18n.cookieValues used instead of app.$cookies.get Issue #65 (opens new window)
[Fix] Filters checkboxes not showing current state #87 (opens new window)