Merge branch 'master' of https://github.com/cormullion/Karnak.jl #43

Job	Run time
Documentation	4m 42s
Julia 1.6 - ubuntu-latest - x64	2m 6s
Julia 1.6 - macos-latest - x64	2m 42s
Julia 1.6 - windows-latest - x64	5m 36s
Julia 1 - ubuntu-latest - x64	2m 24s
Julia 1 - macos-latest - x64	3m 0s
Julia 1 - windows-latest - x64	3m 35s
Julia nightly - ubuntu-latest - x64	2m 40s
Julia nightly - macos-latest - x64	3m 59s
Julia nightly - windows-latest - x64	5m 3s
	35m 47s

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