Change defer interval to 1 second.

change defer to 1 second (the minimum timer interval for background tabs).

merged multiple stores into one extension

supports Whole Foods, Amazon Fresh, Costco Sameday, Instacart.

add costco_sameday_delivery_time v1.0.0

v1.0.1

Update README.md

includes whole_foods_delivery_slot v1.0.2

v1.0.0

auto select time slots and submit