Updated data sources

[Mike-Dax]

Hello,

I've updated the data sources, massaging the US source to the same format as the Global source.

uscases.rename(columns={
    'Country_Region':'Country/Region',
    'Province_State':'Province/State',
    'Long_':'Long'
}, inplace=True)

uscases = uscases.drop(columns=['UID', 'iso2', 'iso3', 'code3', 'FIPS', 'Admin2', 'Combined_Key'])

I've also removed the 'Recovered' US state.

Thanks!