fix: pytest-asyncio version conflict

[ojgenbar]

Description

pytest-asyncio>=0.11 depends on Pytest 5.4.0 and up (details here pytest-dev/pytest-asyncio#142), but requirements.txt states
pytest>=4.4.1,<4.6

That is why make test failing after clonning.

Steps to reproduce:

git clone git@github.com:aiogram/aiogram.git temp_dir123
cd temp_dir123
python3.7 -m venv venv
. venv/bin/activate
pip install -r dev_requirements.txt
make test

This small fix solved it for me.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Manually

Test Configuration:

• Operating System: Ubuntu 18.04
• Python version: Python 3.7.5

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[uwinx]

@ojgenbar, great thanks for the PR. do tests run with pytest>=5.4.0? if positive -- maybe we can update pytest itself instead of pytest-asyncio?

[ojgenbar]

Yeah, I have not tried it.

This configuration works:

pytest>=5.4
pytest-asyncio>=0.10.0

at list for versions:

pytest==5.4.2
pytest-asyncio==0.10.0

and

pytest==5.4.2
pytest-asyncio==0.12.0