feat: add HackSquad to Hacktoberfest Swag Listing

[kev-odin]

Thanks for contributing to the Hacktoberfest Swag List 😃 🎉! Before submitting your pull request, please check off as many of the items below as you can:

1. I have read the Contributing.md file and formatted this PR correctly
2. I'm not adding a company from the blocklist
3. I make sure to fix things promptly if an error or suggestion comes up

Thanks and Happy Hacktoberfest! 🎉
Tagging @crweiner to take a look. 👀

fixes #670

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[codeclimate]

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[crweiner]

Hello again @kev-odin! 👋 Thank you for your PR to add HackSquad to the Hacktoberfest Swag List! It's cool to see a leaderboard-style Hackathon come back. Sendgrid used to participate in Hacktoberfest and did this as well, which I throughly enjoyed participating in. 🥇

Hope you're having a great Hacktoberfest! Thanks again!