Update civic_hackers.yml for Flexion

[tomwillis608]

Thanks for the contribution! Below is a template that can make it easier when submitting your Organization:

Your Organization: Flexion Inc
GitHub Organization url: https://flexion.us
Country/Locality: Madison, WI, USA

Inclusion requirements:

• [x] Referenced account is an Organization not a User^
• [ ] If this is a government project, your Organization's description should include a reference to your country/agency.
• [x] Make sure your Organization includes at least one public repository
• [x] Please also include a URL for your organization that links back to your organization or agency homepage.

^ If you want to convert your account to an org, details can be found here: https://help.github.com/articles/converting-a-user-into-an-organization/

:heart: GitHub Government Contributors