lower compat of DataFrames #2

Job	Run time
build	3m 7s
Julia 1 - ubuntu-latest -	4m 47s
Julia nightly - macOS-latest -	3m 13s
Julia nightly - ubuntu-latest -	4m 48s
Julia 1 - macOS-latest -	3m 14s
Julia 1 - windows-latest -	5m 21s
Julia 1.6 - ubuntu-latest -	3m 5s
Julia nightly - windows-latest -	3m 35s
Julia pre - macOS-latest -	4m 18s
Julia 1.6 - macos-latest - x64	4m 4s
Julia pre - ubuntu-latest -	5m 7s
Julia 1.6 - windows-latest -	9m 12s
Julia pre - windows-latest -	6m 15s
	1h 0m 6s

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