Add functionality for multiple facet search
Breaking Change:
* get_series_via_route is no longer able to handle multiple series
You can still create your own for loop outside of the function.
For example:
python
data = []
for item in ["RNGC1", "RNGC2"]:
df = eia.get_series_via_route(
route="natural-gas/pri/fut",
series=item,
frequency="daily",
facet="series",
)
data.append(df)
df = pd.concat(data, axis=1)
df.head()