gitrd.get.info.companies: Reads up to date information about Bovespa companies from a github file
Description
A csv file with information about available companies and time periods is downloaded from github and read.
This file is updated periodically and manually by the author. When run for the first time in a R session, a .RDATA file
containing the output of the function is saved in tempdir() for caching.
A string that sets the type of information to be returned ('companies' or 'companies_files').
If 'companies', it will return a dataframe with several information about companies, but without download links.
Value
A dataframe with several information about Bovespa companies