[R] Reorganize the data (dplyr or other packages?)

[John]

Is there any quick way (dplyr?) to arrange the data
 date          down       uc       up
2019M08   0.01709827 0.2653882 0.7175136
2019M09   0.02094724 0.2265797 0.7524731
2019M10   0.01750911 0.2450030 0.7374879

to
 date          direction  percentage
2019M08   down 0.01709827
2019M09   down 0.02094724
2019M10   down 0.01750911
2019M08   uc 0.2653882
2019M09   uc 0.2265797
2019M10   uc 0.2450030
2019M08   up  0.7175136
2019M09   up 0.7524731
2019M10   up 0.7374879

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