CI: Update to CompatHelper v3 (#76) #100

Job	Run time
Julia 1.3 - ubuntu-latest - x64 - push	3m 6s
Julia 1.3 - ubuntu-latest - x86 - push	4m 25s
Julia 1.3 - macOS-latest - x64 - push	4m 30s
Julia 1.3 - windows-latest - x64 - push	10m 12s
Julia 1.3 - windows-latest - x86 - push	11m 29s
Julia 1 - ubuntu-latest - x64 - push	2m 29s
Julia 1 - ubuntu-latest - x86 - push	2m 57s
Julia 1 - macOS-latest - x64 - push	3m 19s
Julia 1 - windows-latest - x64 - push	3m 50s
Julia 1 - windows-latest - x86 - push	4m 36s
Julia nightly - ubuntu-latest - x64 - push	2m 57s
Julia nightly - ubuntu-latest - x86 - push	3m 36s
Julia nightly - macOS-latest - x64 - push	5m 45s
Julia nightly - windows-latest - x64 - push	4m 26s
Julia nightly - windows-latest - x86 - push	4m 50s
	1h 12m 27s

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