Update documentation on what properties are available in the event

[sephirothmk]

Initially I didn't know this and made a fork in order to get the data I want from the event, but later I found out that you have the data already available in the event object. Maybe you can update the documentation on the event object to include:

let tableMap = event.tableMap[event.tableId]; tableMap.parentSchema tableMap.tableName event.rows //array, also update event has before and after objects

For example, for the update event im getting the data like this:
event.rows.forEach(function(row) { Object.keys(row.before).forEach(function(name) { if (row.before[name] !== row.after[name]) { dbUpdate.updatedRows.push({[name]: row.after[name]}); } }); });

Would be useful info for new users.