0.5.2 (2018-07-18)
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* add 'dcast' and 'melt' methods for data.frame
* add ':=' operator for 'take'/'take_if'/'summarize' for parametric evaluation

0.5.1 (2018-05-09)
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* fix stupid bug with incorrect minimal version of data.table in DESCRIPTION
* add 'dplyr'-like interface.

0.5.0 (2018-05-05)
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* initial release

