Merge pull request #47 from JuliaAstro/documenter-update #24

Job	Run time
Documentation	1m 19s
Julia 1.0 - ubuntu-latest - x64	3m 28s
Julia 1.0 - macos-latest - x64	3m 40s
Julia 1.0 - windows-latest - x64	6m 34s
Julia 1 - ubuntu-latest - x64	2m 14s
Julia 1 - macos-latest - x64	2m 32s
Julia 1 - windows-latest - x64	3m 36s
Julia nightly - ubuntu-latest - x64	3m 23s
Julia nightly - macos-latest - x64	2m 25s
Julia nightly - windows-latest - x64	4m 22s
	33m 33s

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