Added Stack Builders to the Hacktoberfest Swag List

[yashwanthvarma18]

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. 👀

[codeclimate]

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[vimode]

PR #775 adds stackbuilders to the list.

[crweiner]

Hi @yashwanthvarma18, thank you very much for your PR! Stack Builders has been added now in #775, but do feel free to raise another PR to add another organization to the Swag List or fix any issues you may see.

Thank you again, and I hope you're having a great Hacktoberfest! 🎃