Description of problem:
After installing python3-matrix-nio on a (kind-of) minimal Fedora system it can't be used because its import fails since the Crypto module isn't available.

Version-Release number of selected component (if applicable):
python3-matrix-nio-0.15.2-1.fc32.noarch

How reproducible:
always

Steps to Reproduce:
1. dnf install python3-matrix-nio
2. python3 -c 'import nio'
3.

Actual results:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.8/site-packages/nio/__init__.py", line 2, in <module>
    from .client import *
  File "/usr/lib/python3.8/site-packages/nio/client/__init__.py", line 3, in <module>
    from .base_client import Client, ClientConfig
  File "/usr/lib/python3.8/site-packages/nio/client/base_client.py", line 35, in <module>
    from ..crypto import ENCRYPTION_ENABLED
  File "/usr/lib/python3.8/site-packages/nio/crypto/__init__.py", line 16, in <module>
    from .attachments import encrypt_attachment, decrypt_attachment
  File "/usr/lib/python3.8/site-packages/nio/crypto/attachments.py", line 24, in <module>
    from Crypto import Random
ModuleNotFoundError: No module named 'Crypto'

Expected results:
the import command succeeds, i.e. no output, success exit status

Additional info:
I assume that this issue can also be reproduced on Fedora 33.

Workaround: Manually install python3-crypto as well.

Obvious fix: add python3-crypto as a python3-matrix-nio package dependency.