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rb3 0.0.5

• Updated documentation
• The cache creates a folder with the template to organize files inside the cache folder.
• read_marketdata lost the argument cachedir, the RDS file with parsed data is saved in the directory of the given file.
  • Pass do_cache = FALSE to not save the RDS file, it defaults to TRUE.
• Corrected BUG in COTAHIST_YEARLY, it uses cache wrongly (Issue #44)
• Corrected BUG due to change in fixedincome - function rates was renamed to implied_rate