These functions are simple wrappers around the various useful API end points
that are helpful for finding avaiable data and filtering the data you are
interested in when using wb_data()
wb_countries(lang)wb_topics(lang)
wb_sources(lang)
wb_regions(lang)
wb_income_levels(lang)
wb_lending_types(lang)
wb_languages()
Language in which to return the results. If lang is unspecified,
english is the default. For supported languages see wb_languages().
Possible values of lang are in the iso2 column. A note of warning, not
all data returns have support for langauges other than english. If the specific
return does not support your requested language by default it will return NA.
A tibble of information about the end point