Applied the singleton pattern to scrape_rss #193
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Applying the singleton pattern to scrape_rss is logical because there should be only one available instance of the rss scraper. Multiple scrape_rss instances does not make sense and could lead to unforeseen bugs in the code. I refactored rss_scraper by adding the get_instance method and turning the constructor into a 'virtual' private constructor to prevent other classes from making more than one instance of the class.