Automated data loader and registration to PyPI

New:

• Automated data loader: DataLoader class downloads the dataset from servers automatically
• Registration to PyPI: we can now install CovsirPhy with pip install covsirphy

ODE simulation with tau-free (not non-dimensional) dataset

Update for issue #5

• ODE simulation with tau-free dataset (with time step [-] and ODE variables [persons])
• Interface of Scenario class was not changed
• tau value [min] will be fixed to divisors of 1440 [min]

Update of interface

Second release of Covsirphy package. Interface was updated and we can do data cleaning and scenario analysis with simpler codes.

Initial release

Initial release of covsirphy package. Usage is explained in Kaggke notebook.