revert some weakdeps, fix #192 #637

Job	Run time
Documentation	1m 14s
Julia 1.6 - ubuntu-latest - x64 - push	1m 52s
Julia 1.6 - windows-latest - x64 - push	15m 36s
Julia lts - ubuntu-latest - x64 - push	1m 46s
Julia lts - windows-latest - x64 - push	2m 54s
Julia 1 - ubuntu-latest - x64 - push	2m 55s
Julia 1 - windows-latest - x64 - push	4m 37s
Julia pre - ubuntu-latest - x64 - push	3m 5s
Julia pre - windows-latest - x64 - push	3m 41s
Julia nightly - ubuntu-latest - x64 - push	4m 27s
Julia nightly - windows-latest - x64 - push	5m 17s
	47m 24s

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