Merge pull request #22 from JuliaAlgebra/mk/fix/promote_type #92

Job	Run time
Documentation	36s
Julia 1.6 - ubuntu-latest - x64	57s
Julia 1.6 - macOS-latest - x64	2m 1s
Julia 1.6 - windows-latest - x64	9m 51s
Julia 1 - ubuntu-latest - x64	1m 0s
Julia 1 - macOS-latest - x64	2m 2s
Julia 1 - windows-latest - x64	1m 41s
Julia nightly - ubuntu-latest - x64	1m 13s
Julia nightly - macOS-latest - x64	2m 13s
Julia nightly - windows-latest - x64	1m 50s
	23m 24s

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