Collect Daily Command

[LeoSaucedo]

Implement the ;collect daily command with the following spec:

• When a user calls ;collect daily, the user may gain 1-5 points if they have not collected in the last 24 hours.
• If a user calls ;collect daily more than once in the last 24 hours, the bot must notify the user they have already collected for the day.
• The timestamp from the leaderboard table in the database must be queried to look up and update the last collected time.

For convenience, the schema for the leaderboard table is below:

CREATE TABLE leaderboard(
  server varchar(20) NOT NULL,
  user varchar(20) NOT NULL,
  score int NOT NULL,
  collectionDate date NOT NULL,
  PRIMARY KEY (server, user)
  );