• This is a very simple voting contract.
• Because txs are private no one knows what people are voting.
• TODOs:
  • Prevent double voting
  • Prevent voting after a deadline
  • Make the tally public only after a deadline
    • Or maybe a simpler solution: return the tally only every 10th vote, that way we obfuscate the last vote (after a vote, if (tally.yes+tally.no) % 10 == 0 do set(public_yes, tally.yes) and set(public_no, tally.no) and on get_tally return public_yes and public_no).