- There is now a proper message when the daily API call limit is exceeded. Before the change, methods would
return a `JSONDecodeError`.
- The Python 2 to 3 compatibility package `six`, has been added as a requirement for package installation.
The `six` library is lightweight and ensures the `petpy` package works properly for Python 2 and 3.
- Numpy is no longer required for installing the package. Numpy's `nan` was initially used to denoted shelters animals
that were not found in the Petfinder database. The value returned when a shelter or animal is not found is now 'na'.