0.27.0

Release notes

Breaking changes

• Converted the UserDefinedInstrument enum class to an enum to safely allow handling
  invalid data and adding future variants
• Updated the value of the kMaxRecordLen constant for the changes to
  InstrumentDefMsg in version 3

Enhancements

• Added v3 namespace in preparation for future DBN version 3 release. DBN version 2
  remains the current and default version
• Added v3::InstrumentDefMsg record with new fields to support normalizing multi-leg
  strategy definitions
  • Removal of statistics-schema related fields trading_reference_price,
    trading_reference_date, and settl_price_type
  • Removal of the status-schema related field md_security_trading_status