Replaced string.format () and % with f-strings.

[chriszaro]

Pylint reports "[consider-using-f-string". f-string is faster, more readable and futureproof. Pylint now reports about 300 less conventions. There are more to be refactored.

After creating your pull request, tick these boxes if they are applicable to you.

• [ ] I have tested my changes against the review branch (the latest developmental version), and this pull request is targeting that branch as a base
• [ ] I have tested my changes on Python 3.8 or higher
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Related issues (if applicable)

[BabyBoySnow]

Hello, actually the dev branch is already py linted. We're just holding off on putting it on master for the reason that sev currently uses the most up-to-date discord.py, which hasn't been released on pypi yet so we have changes that won't work. Additionally, please review our pull request guidelines, you've targeted the wrong branch, pull request should target the dev branch. Additionally you haven't said if you've tested these changes.