the previous help message is a little bit confusing

Updates:

• /stats Show descriptive statistics.
• /interval [low] [up] List players' balance in a specific interval.
• /perc [low] [up] Show the percentile of players' balance.
• /checkrecords Show all operations.
• /checkrecord <operation_id> Show details of a specific operation.
• /restore <operation_id> Restore a specific operation.
• added language option in config
• added sqlite for records
• fixed some bugs
• some potential new bugs

Added soft-depend of Essentials, avoid dependency not found error

fixed some scheduler bugs
now routinely tax charging should work fine

Users can create a tax account and store the charged tax in the account.
Please make sure players won't be able to get that account.

added:
- player existence check & case sensitive
- prevent deduction > balance