Document and test `windowbits` option (#95) #54

Job	Run time
Julia lts - ubuntu-latest - default - push	1m 18s
Julia lts - ubuntu-latest - x86 - push	1m 20s
Julia lts - windows-latest - default - push	1m 44s
Julia lts - windows-latest - x86 - push	2m 27s
Julia lts - macos-latest - default - push	56s
Julia 1 - ubuntu-latest - default - push	1m 48s
Julia 1 - ubuntu-latest - x86 - push	2m 11s
Julia 1 - windows-latest - default - push	2m 41s
Julia 1 - windows-latest - x86 - push	3m 18s
Julia 1 - macos-latest - default - push	1m 23s
Julia nightly - ubuntu-latest - default - push	2m 12s
Julia nightly - ubuntu-latest - x86 - push	2m 40s
Julia nightly - windows-latest - default - push	3m 36s
Julia nightly - windows-latest - x86 - push	3m 39s
Julia nightly - macos-latest - default - push	1m 35s
Julia min - ubuntu-latest - x64 - push	1m 11s
	33m 59s

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