rm documenter version, show warnings while building #57

Job	Run time
build	2m 1s
Julia 1.6 - ubuntu-latest - x64	1m 16s
Julia 1.6 - macOS-latest - x64	1m 50s
Julia 1.6 - windows-latest - x64	7m 55s
Julia 1.7 - ubuntu-latest - x64	1m 35s
Julia 1.7 - macOS-latest - x64	2m 30s
Julia 1.7 - windows-latest - x64	2m 19s
Julia nightly - ubuntu-latest - x64	2m 8s
Julia nightly - macOS-latest - x64	2m 49s
Julia nightly - windows-latest - x64	3m 1s
	27m 24s

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