feat: update version to 0.2.1 and add rolling min/max indicators (#6)

* feat: add session tracking and multi-leg spread backtesting

Add SessionTracker for trading session management:                             - Market hours detection (pre-open, trading, squareoff, post-close)
 - Session boundary tracking with configurable timezone    - Squareoff time support for intraday strategies                                   - Session high/low/open price tracking

Add SpreadBacktest for multi-leg options strategies:                                  - Support for straddles, strangles, vertical spreads, iron condors                                      - Coordinated entry/exit across all legs                                             - Net premium P&L calculation with max loss/target profit exits                                            - Helper functions for common spread configurations

Extend StreamingMetrics for backtest integration:                                - Add equity and drawdown tracking (update_equity, current_drawdown_pct)           - Add trade recording (record_trade, record_fees)                              - Add finalize() method to produce BacktestMetrics                        - Add with_initial_capital() constructor

Bump version to 0.2.0.

* chore: bump up version to 0.2.0

* feat: update version to 0.2.1 and add rolling min/max indicators

* fix: formatting

python/raptorbt/__init__.py

@@ -37,7 +37,7 @@ from raptorbt._raptorbt import (
     supertrend,
 )
 
-__version__ = "0.1.0"
+__version__ = "0.2.1"
 
 __all__ = [
     # Config classes