v0.2.0

What's changed

Full changelog: v0.1.0...v0.2.0

Added

• list-fixtures command (#10)
• load-fixture command (#10)
• DB.execute_sql() method for running arbitrary SQL against a database (#10)
• execute-sql command (#10)

Changed

• Schema version when applying schema.sql comes from max migration version,
  removing the need to track the version table and update it in that file. (#10)