Bump julia-actions/setup-julia from 1 to 2 (#168) #262

Job	Run time
Documentation	1m 51s
Julia 1.0 - ubuntu-latest - x64	3m 19s
Julia 1.0 - macos-latest - x64	4m 8s
Julia 1.0 - windows-latest - x64	7m 8s
Julia 1 - ubuntu-latest - x64	2m 24s
Julia 1 - macos-latest - x64	5m 10s
Julia 1 - windows-latest - x64	3m 19s
Julia nightly - ubuntu-latest - x64	3m 54s
Julia nightly - macos-latest - x64	6m 37s
Julia nightly - windows-latest - x64	4m 43s
	42m 33s

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