Merge pull request #80 from JuliaConstraints/dev #381

Job	Run time
Julia lts - ubuntu-latest - x64 - push	4m 30s
formatter (1, x86, ubuntu-latest)	53s
Julia lts - ubuntu-latest - x86 - push	5m 10s
Julia 1 - ubuntu-latest - x64 - push	7m 10s
Julia 1 - ubuntu-latest - x86 - push	8m 29s
Julia pre - ubuntu-latest - x64 - push	6m 59s
Julia pre - ubuntu-latest - x86 - push	8m 23s
Julia 1 - macOS-latest - x64 - push	7m 12s
Julia 1 - windows-latest - x64 - push	7m 58s
Julia 1 - windows-latest - x86 - push	8m 40s
	1h 5m 24s

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