Saving plots to .rds files

[teunbrand]

The advice given in this section of the book:

ggplot2-book/getting-started.Rmd

Lines 526 to 533 in bf758ab

	* Save a cached copy of it to disk, with `saveRDS()`. This saves a complete
	copy of the plot object, so you can easily re-create it with `readRDS()`.
	\indexf{saveRDS} \indexf{readRDS}
	```{r summary}
	saveRDS(p, "plot.rds")
	q <- readRDS("plot.rds")
	```

Is being called a 'flawed workflow' in tidyverse/ggplot2#3994 (comment) and complicates between-version compatability as mentioned here: tidyverse/ggplot2#3994 (comment). I think it might be best to omit this advice altogether.

[hadley]

Oh yeah, that's definitely a DON'T DO.

[djnavarro]

ooh, yeah, I'll fix that one now!

[teunbrand]

Thanks!