add support for heterogeneous files (#156) #13

Job	Run time
Documentation	5m 14s
Julia 1.6 - ubuntu-latest - x64 - push	2m 52s
Julia 1.6 - macOS-latest - x64 - push	3m 17s
Julia 1.6 - windows-latest - x64 - push	10m 0s
Julia 1 - ubuntu-latest - x64 - push	2m 53s
Julia 1 - macOS-latest - x64 - push	2m 44s
Julia 1 - windows-latest - x64 - push	4m 39s
Julia nightly - ubuntu-latest - x64 - push	3m 39s
Julia nightly - macOS-latest - x64 - push	5m 4s
Julia nightly - windows-latest - x64 - push	6m 27s
	46m 49s

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