fix docs build and bump version again (#270) #220

Job	Run time
test (1.6, ubuntu-latest, x64, Others)	4m 26s
test (1.6, ubuntu-latest, x64, ForwardDiff)	1h 53m 16s
test (1.6, ubuntu-latest, x64, Tracker)	16m 38s
test (1.6, ubuntu-latest, x64, ReverseDiff)	55m 18s
test (1.6, ubuntu-latest, x64, Zygote)	32m 16s
test (1, ubuntu-latest, x64, Others)	3m 44s
test (1, ubuntu-latest, x64, ForwardDiff)	1h 7m 23s
test (1, ubuntu-latest, x64, Tracker)	16m 0s
test (1, ubuntu-latest, x64, ReverseDiff)	17m 18s
test (1, ubuntu-latest, x64, Zygote)	28m 20s
test (1, macOS-latest, x64, Others)	7m 19s
test (1, macOS-latest, x64, ForwardDiff)	2h 51m 13s
test (1, macOS-latest, x64, Tracker)	16m 3s
test (1, macOS-latest, x64, ReverseDiff)	23m 58s
test (1, macOS-latest, x64, Zygote)	24m 57s
	9h 58m 9s

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