v3.0.0b1 'stable beta 1'

What's Changed

• Iteration 'stable beta 1 - new docs' (#13) @hotenov

🐞 Fixes

Remove needless datetime conversion to UTC
Correct 'short_date' attribute

📚 Documentation

Update README
Completely new documentation for version 3 on RTD website (not in Wiki)

👷 Continuous Integration

Integrate 'Furo' theme for docs.