Bump julia-actions/setup-julia from 1 to 2 (#78) #108

Job	Run time
Julia 1.3 - ubuntu-latest - x64 - push	3m 36s
Julia 1.3 - ubuntu-latest - x86 - push	4m 38s
Julia 1.3 - macOS-latest - x64 - push	4m 48s
Julia 1.3 - windows-latest - x64 - push	11m 14s
Julia 1.3 - windows-latest - x86 - push	14m 5s
Julia 1 - ubuntu-latest - x64 - push	2m 2s
Julia 1 - ubuntu-latest - x86 - push	2m 51s
Julia 1 - macOS-latest - x64 - push	4m 12s
Julia 1 - windows-latest - x64 - push	4m 12s
Julia 1 - windows-latest - x86 - push	3m 48s
Julia nightly - ubuntu-latest - x64 - push	2m 56s
Julia nightly - ubuntu-latest - x86 - push	4m 7s
Julia nightly - macOS-latest - x64 - push	3m 45s
Julia nightly - windows-latest - x64 - push	4m 36s
Julia nightly - windows-latest - x86 - push	4m 54s
	1h 15m 44s

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