Norberto Lopes

Switch to new style Supervisor child spec

1

Ensures the following warning disappears: ``` warning: Supervisor.Spec.worker/2 is deprecated. Use the new child specifications outlined in the Supervisor module instead lib/bigflake/application.ex:12: Bigflake.Application.start/2 ```

This may be a bit controversial but doing this casting, although introducing a trivial cast, allows for slightly better portability I think. If not, running this in a specific VM...