fix: EMNIST url invalid

[xweiba]

rt

Fixes #25

[sebastianillges]

from extra_keras_datasets import emnist

emnist.load_data(type='balanced')

Error:
emnist.load_data(type='balanced')
File "/usr/local/lib/python3.11/site-packages/extra_keras_datasets/emnist.py", line 58, in load_data
with ZipFile(path, "r") as opened_zip:
^^^^^^^^^^^^^^^^^^
File "/usr/local/Cellar/[email protected]/3.11.6_1/Frameworks/Python.framework/Versions/3.11/lib/python3.11/zipfile.py", line 1302, in init
self._RealGetContents()
File "/usr/local/Cellar/[email protected]/3.11.6_1/Frameworks/Python.framework/Versions/3.11/lib/python3.11/zipfile.py", line 1369, in _RealGetContents
raise BadZipFile("File is not a zip file")
zipfile.BadZipFile: File is not a zip file

[christianversloot]

Thank you!

[xweiba]

Thank you! 谢谢你！

This project has saved me a significant amount of time, and I should thank you for your work.