CRAN release: 5.2.9

• feat: new optional marginals/carryovers params to add metrics to robyn_performance()
• feat: new repeated param on scrabble_words()
• feat: new "chars" and "unique" scoring systems on scrabble_words()
• fix: cache of OpenAI's reply stored in JSON format
• fix: better handle of filenames on get_mp3()
• fix: param exclude_here accepts upper case too for scrabble_words()
• docs: update meta API version to v20.0
• recode: fix some codefactor warnings on return()'s + font warning in Windows #55

Full Changelog: v5.2.8...v5.2.9