Prepare CRAN release #1337

Job	Run time
R-CMD-check / macOS-latest (release)	5m 37s
R-CMD-check / windows-latest (devel)	12m 36s
R-CMD-check / windows-latest (release)	12m 32s
R-CMD-check / windows-latest (oldrel)	12m 52s
R-CMD-check / windows-latest (4.1)	5m 13s
R-CMD-check / ubuntu-latest (devel)	15m 38s
R-CMD-check / ubuntu-latest (release)	15m 40s
R-CMD-check / ubuntu-latest (4.3)	13m 54s
R-CMD-check / ubuntu-latest (4.2)	1m 2s
R-CMD-check / ubuntu-latest (4.1)	1m 7s
R-CMD-check / ubuntu-latest (4.0)	56s
R-CMD-check / ubuntu-latest (3.6)	56s
	1h 38m 3s

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