New Chapter for dallas tx 75207

[geografa]

Summary
Maptime name: design district
Contact name: Key
Date submitted: 2018-08-07 16:16:51

• Add GH admins to new team:
• Add Location (dallas tx 75207) to chapters.json and /chapters page.

Additional tasks

• Add to Slack
• set _config.yml file

/cc @maptime/admin-onboarders