Aggregation Pull Request #2

[Zy8712]

Commit: "Aggregation Pull Request #2"

• Unlike last time, I actually correctly executed my pull request on a separate branch...
• Continuing off of my previous pull request, I made an indication as to the divide I made between generalized data searches and specific country-based data searches
• In this pull request I divide the previous COVID19DataRetrieval class further down into two separate classes, COVID19GeneralizedDataRetrieval and COVID19CountryBasedDataRetrieval
• Methods in the COVID19GeneralizedDataRetrieval class are mainly those that don't require much specification or information (getAll, getLatest, etc.)
• Methods in the COVID19CountryBasedDataRetrieval class are mainly those that require specific information from the user (get data by country code/name/id)

Further details regarding this pull request will be stated in the report.