v0.2.0

Changes:

• Rewritten trading engine
• Multicolumn partial indexes on the database
• Removal of all database triggers
• Locked down database permissions for the frontend
• 2FA recovery codes
• 2FA verification is now on the database (frontend cannot authorize actions without a token)
• PGP encryption of emails
• API keys for automated trading
• Option to have asymmetric trading fees
• Pagination of account history using continuous scroll
• Many other bug fixes and improvements