Merge pull request #624 from stan-dev/andrjohns-patch-1 #189

Job	Run time
CRAN RStan - macOS-latest (devel)	21m 59s
CRAN RStan - macOS-latest (release)	9m 11s
CRAN RStan - windows-latest (devel)	16m 19s
CRAN RStan - windows-latest (release)	16m 45s
CRAN RStan - ubuntu-latest (devel)	47m 41s
CRAN RStan - ubuntu-latest (release)	44m 22s
CRAN RStan - ubuntu-latest (oldrel)	43m 34s
Preview RStan - macOS-latest (release)	9m 12s
Preview RStan - windows-latest (release)	16m 14s
	3h 45m 17s

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