Display what days you need to check on for the optimal outcome #577
Description
Is your feature request related to a problem? Please describe.
I'd like to be able to check turnip prices as little as possible, while still getting the optimal sell price.
Describe the solution you'd like
The calculator should display vertical lines on the graph to tell you when you need to check prices in order to get the best possible outcome, since sometimes checking on a specific day isn't needed. It should also give you the option to click one of these vertical lines to indicate "I won't check on this day" and see what impact it will have.