Fixes levels "trees" and "characters" being ignored in add_meta()

ropensci / RNeXML

Implementing semantically rich NeXML I/O in R

https://docs.ropensci.org/RNeXML

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Closed hlapp closed 5 years ago

hlapp commented 5 years ago

Adds tests for all accepted levels. Closes #213.

cboettig commented 5 years ago

Looks good to me. ready to merge