Reminder Plugin Improvements

[finnbar]

There is already a reminder plugin provided in Tablebot.Plugins.Reminder. This is fairly rudimentary and could be improved.

• Use the user's timezone as to correctly remind them. Still store this in the database as UTC, but you'll need to determine the timezone and change their inputted date/time accordingly.
• Accept formats other than DD/MM/YYYY HH:MM. Some ideas follow, although you might want to look at what Haskell's duckling package can provide.
  • Just a date, defaulting to midday.
  • Days such as "on the 21st" which autofill month and year.
  • Relative datetimes, such as "in ten hours".
• Allow users to delete their own reminders.

Other ideas are of course welcome, but these are a few I thought of.

[finnbar]

May want to utilise this: https://github.com/dixonary/duckling-example

[L0neGamer]

Some of this is covered in #37.

[finnbar]

Closing in favour of #96