Added new key: leucht2020 (https://doi.org/10.1176/appi.ajp.2019.19010034)
Added additional tests to compare results to spreadsheet by Leucht et al. with similar purpose.
Added new vignette with examples from each of the keys (references).
Added additional tests and code cleanup.
This is the first CRAN release of the package. The package has just passed peer-review through rOpenSci. It is published in a fully functional state.