add upvotes for props
add counter cache to prop upvotes
API endpoint for creating upvotes
add ability to upvote prop via button
remove upvotes from eager loading
add ability to fetch props with additional info about user and their eventual upvote of a given prop
add is_upvote_possible attribute to prop serializer
generate few uproots in seeds
validate upvotes
return proper json during upvoting
UI changes for prop list items
update changelog for new release