0.6.8 (17.06.2019)
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* maintainance release
* convert documentation to markdown
* add rmarkdown to SUGGESTS
* move tests from testthat to tinytest

0.6.7 (17.06.2019)
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* urgent fix for bug with incorrect counter in 'alter' when used with 'exclude'
* change behaviour 'lag_list':  x -> list(x[[i-1]], x[[i]])

0.6.6 (07.06.2019)
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* add 'exclude' function for dropping elements from data.frame/list in 'alter'

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
