To avoid this unexpected warning and error, the dependence on shinythemes could be clarified in the README.
> RDML::rdmlEdit()
Loading required package: shiny
Listening on http://127.0.0.1:7933
Warning: Error in library: there is no package called ‘shinythemes’
74: <Anonymous>

To avoid this unexpected warning and error, the dependence on shinythemes could be clarified in the README.