v1.6.15 release candidate (#397) #440

Job	Run time
R-CMD-check / setup	25s
routine / routine	4m 56s
website / pkgdown	3m 21s
R-CMD-check / macOS-latest (4.3.3)	5m 19s
R-CMD-check / windows-latest (devel)	6m 10s
R-CMD-check / windows-latest (4.3.3)	6m 52s
R-CMD-check / windows-latest (4.1)	13m 49s
R-CMD-check / windows-latest (3.6)	11m 5s
R-CMD-check / ubuntu-20.04 (devel)	5m 16s
R-CMD-check / ubuntu-20.04 (4.3.3)	5m 12s
R-CMD-check / ubuntu-20.04 (4.2.3)	5m 3s
R-CMD-check / ubuntu-20.04 (4.1.3)	5m 22s
R-CMD-check / ubuntu-20.04 (4.0.5)	5m 41s
R-CMD-check / ubuntu-20.04 (3.6.3)	5m 3s
R-CMD-check / ubuntu-latest (4.3.3)	5m 51s
R-CMD-check / ubuntu-latest (4.2.3)	5m 7s
R-CMD-check / ubuntu-latest (4.1.3)	5m 40s
R-CMD-check / ubuntu-latest (4.0.5)	5m 14s
R-CMD-check / ubuntu-latest (3.6.3)	5m 4s
	1h 50m 30s

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