Winners are save locally to a file

On each Send action from UI there will be a try to save data locally and to send to email.

Local save is done to ./<event_id>.txt file. The exact file path is printed to the output in a format:

========================
Data was saved to /<absolute path>/./<event_id>.txt
========================

Content will be like:

Winners for <meetup name> at <readable date-time> are:
  James Rose: intellij or any other on your choice
  RS: JRebel
  Slava Galperin: JRebel
  C L: JRebel
  Siddharth Vora: Akka Concurrency

So files are written per event. If the same event is used for several meetup rolls then data will be accumulated in 1 file.

If errors occur while saving or sending then on UI you will see separate message for saving and separate for sending (success info or a warning).