R version required in DESCRIPTION differs from version specified in expect-doppelganger.R

[JSchoenbachler]

The R version required in the DESCRIPTION file is R 3.2.0 -

vdiffr/DESCRIPTION

Line 25 in fc03e91

R (>= 3.2.0)

Meanwhile, the expect_doppleganger function skips test evaluation if it is on any version before R 4.1.0 -

vdiffr/R/expect-doppelganger.R

Lines 171 to 173 in fc03e91

	is_graphics_engine_stale <- function() {
	getRversion() < "4.1.0"
	}

As I understand it, R 3.2.0 is fine to use for the write_svg function, but not for the actual expect_doppleganger function. This was confusing to me until I actually read the source code, since there isn't any mention of it on the documentation site (other than a small blurb in the changelog under the unreleased 0.4.0 version).

I think it would make it more clear if you either updated the DESCRIPTION R version requirement or added a blurb about the R version soft requirement to the documentation!