Relevant Issues

https://github.com//issues/1691?notification_referrer_id=NT_kwDOBivkC7UxODE0MTkwMjE5MjoxMDM1Mzk3MjM#event-19124053085

Description

Changes made:

• Extend the existing 'joke' command with 'dad' category using icanhazdadjoke API
• Keep the existing joke categories (chuck, neutral, all)
  How it's implemented:
• When dad joke is called, an asynchronous HTTP GET request is made to https://icanhazdadjoke.com with aiohttp
• Implement user agent to comply with icanhazdadjoke API policy
• The joke from JSON is sent back to the user with ctx.send()
• Linted and tested in a new python file before adding the code to fun.py

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