use 'min' option in julia-setup #233

Job	Run time
Julia min - R release - ubuntu-latest - - pull_request	4m 45s
Julia min - R release - ubuntu-latest - - pull_request	4m 27s
Julia min - R 4.0 - ubuntu-latest - - pull_request	4m 31s
Julia min - R 4.0 - ubuntu-latest - - pull_request	4m 27s
Julia min - R 3.4 - ubuntu-latest - - pull_request	4m 39s
Julia min - R 3.4 - ubuntu-latest - - pull_request	4m 21s
Julia 1 - R release - ubuntu-latest - - pull_request	5m 57s
Julia 1 - R release - ubuntu-latest - - pull_request	5m 57s
Julia 1 - R 4.0 - ubuntu-latest - - pull_request	6m 7s
Julia 1 - R 4.0 - ubuntu-latest - - pull_request	6m 7s
Julia 1 - R 3.4 - ubuntu-latest - - pull_request	6m 7s
Julia 1 - R 3.4 - ubuntu-latest - - pull_request	6m 7s
Julia nightly - R release - ubuntu-latest - - pull_request	8m 28s
Julia nightly - R release - ubuntu-latest - - pull_request	8m 28s
Julia nightly - R 4.0 - ubuntu-latest - - pull_request	8m 26s
Julia nightly - R 4.0 - ubuntu-latest - - pull_request	8m 26s
Julia nightly - R 3.4 - ubuntu-latest - - pull_request	8m 7s
Julia nightly - R 3.4 - ubuntu-latest - - pull_request	8m 7s
Julia 1 - R release - macOS-latest - - pull_request	3m 12s
Julia 1 - R release - macOS-latest - - pull_request	3m 12s
Julia 1 - R release - windows-latest - - pull_request	8m 37s
Julia 1 - R release - windows-latest - - pull_request	8m 37s
	2h 17m 12s

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