Pokedex.py

Dependencies
* Update `requests` package to `>=2.20.0,<3.0.0` to fix information exposure vulnerability (https://github.com/PokeDevs/pokedex.py/issues/1, https://github.com/PokeDevs/pokedex.py/pull/2)

Changes
https://github.com/PokeDevs/pokedex.py/commit/8afe161d916addebdb154845a2e4e20d29369b29 - Update base URL to the new domain.

Additions
* https://github.com/PokeDevs/pokedex.py/commit/184173dae1f37509f72480ff9207a84f622051ec Added `Pokedex.get_pokemon_by_name()` method.
* https://github.com/PokeDevs/pokedex.py/commit/327d159a77def2dda66cf17ae995ac3e02a33417 Added `Pokedex.get_pokemon_by_number()` instead.

Deprecation
* https://github.com/PokeDevs/pokedex.py/commit/327d159a77def2dda66cf17ae995ac3e02a33417 `Pokedex.get_pokemon()` method is now depricated, use `Pokedex.get_pokemon_by_number()` instead.

Improvements
* Code refactoring
* Decreased size

Fixed
* Fixed some minor issues

First release!