Release Version 0.2.1 💖

💎 NEW FEATURE 💎

• Added method to convert RequestHeader to HeaderMap.

🐛 FIX 🐛

• Corrected token issuance message output error: fixed issue where ` was used instead of '.

✏️ ETC ✏️

• Integrated accessToken into apiAuth class.
• Refactored API path constants and TradingID constants.