snow

Implement the funciton in `src/snow.py` with the following specification:
> Snow falls unevenly on Cornell's campus.
> Your objective is, given a dictionary of Cornell
> buildings and their respective snowfall in inches,
> return the building that experienced the most snowfall
> Example input: {Uris: 5, Gates: 3.4, Philips: 7.9}
> Example output: Philips