Beta Update 0.8.4.9
world etf retrieval done - tests need to be made in order to test package consistance and efficiency - ETF tests have been removed due to lack of time of updating them before world etf request - gists created in order to clarify the new use of investpy when it comes to data retrieval explained in https://gist.github.com/alvarob96/107afe09f711eee1b5e71cfeca19674d