version, which is the most recent version before the function (or other object) was deprecated.
gg_depwill give an error, warning, or message, depending on the difference between the current ggplot2 version and the specified
If the current major number is greater than
version's major number,
or if the current minor number is more than 1 greater than
minor number, give an error.
If the current minor number differs from
version's minor number by
one, give a warning.
If the current subminor number differs from
number, print a message.