Convenience function to change the default fiscal year start month
without calling fundr_setup().
Examples
# Save current setting
old_month <- getOption("fundr.fy_start_month")
# Set to October (federal fiscal year)
set_fy_start_month(10)
get_fy_start_month()
#> [1] 10
# Restore previous setting
if (!is.null(old_month)) options(fundr.fy_start_month = old_month)
