banished .DS_Store

[mmenschig]

Removed macOS specific .DS_Store metadata file and added corresponding .gitignore entry

Contributing to Twilio

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

• [x] I acknowledge that all my contributions will be made under the project's license.

[cweems]

Thanks for the contrib!