+++++++++++++++++++
**Improvements**
- 489 countryCode filter added to backtesting
- Renamed config.hostname to config.customer_strategy_ref. This makes the use of the variable more explicit.
- WARNING: This change will affect users who set config.hostname. From this version onwards, they should set config.customer_strategy_ref.
- Docs / logging control updated
**Bug Fixes**
- 487 Backtesting transaction count maxing out (markets not ordered)
**Libraries**
- black upgraded to 21.8b0