Version metadata.json

[SPTKL]

• [ ] Create a separate set of metadata.json for each year
• [ ] Split decennial and acs into two separate json file
• [ ] Repurpose source to indicate acs or decennial
• [ ] Change assignment of self.metadata, self.median, and self.special to parse the year parameter and point to the correct json

To initialize class:

pff = Pff(
    api_key='XXXXXXXXXXXXXXXXX', 
    year = 2018,
    source = 'acs'
)

[SPTKL]

convert them into computed properties

        with open(f"{Path(__file__).parent}/data/metadata.json") as f:
            self.metadata = json.load(f)
        with open(f"{Path(__file__).parent}/data/median.json") as f:
            self.median = json.load(f)
        with open(f"{Path(__file__).parent}/data/special.json") as f:
            self.special = json.load(f)

to

    @cached_property
    def metadata(self) -> list:
           with open(f"{Path(__file__).parent}/data/{source}/{year}/metadata.json") as f:
               return json.load(f)

[SPTKL]

65 #64