add 'tty: true' to the docker-compose file (#490) (#491)
add 'tty: true' to the docker-compose file (#490) (#491)

Motivation:

swift-nio example projects (http, echo) don't print anything to the console when running inside docker container because of buffering issue.

Modifications:

Added tty: true to the docker-compose.yaml for http & echo.

Result:

Buffering issue is resolved. http & echo prints logs to the console.
apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio