message: updated dplyr example
diff: library("DBI")
  library("dplyr")
  -con <- dbConnect(duckdb::duckdb())
  +dsrc <- duckdb::src_duckdb()
  # taken from the dbplyr vignette
  # https://cran.r-project.org/web/packages/dbplyr/vignettes/dbplyr.html
  -copy_to(con, nycflights13::flights, "flights", temporary = FALSE)
  +copy_to(dsrc, nycflights13::flights, "flights", temporary = FALSE)
  -flights_db <- tbl(con, "flights")
  +flights_db <- tbl(dsrc, "flights")
  flights_db %>%
  group_by(dest) %>%
  