0.6.5 (09.04.2019)
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* add 'alter' function for conditional lists/data.frames modification

0.6.0 (18.03.2019)
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* add iterations over multiple lists: to_vec(for(`i, j` in numerate(letters)) if(i %% 2==0) paste(i, j))
* add function 'lag_list':  x -> list(x[i-1], x[i])

0.5.4 (06.03.2019)
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* Initial release
