1.0.9: Merge branch 'main_260129_merge' into 'main'

feat: Add event contracts and US OpenAPI algorithm orders

webull-openapi-java-sdk 1.0.8

feat: Add footprint interface

webull-openapi-java-sdk 1.0.7

feat: Add support for futures and cryptocurrency trading on Webull US

webull-openapi-java-sdk 1.0.6

feat: Optimize token storage

webull-openapi-java-sdk 1.0.5

feat: Optimize samples

webull-openapi-java-sdk 1.0.4

feat: Support futures and crypto trading on Webull US

webull-openapi-java-sdk 1.0.3

feat: Optimize samples

webull-openapi-java-sdk 1.0.2

feat: Supports Webull HK and Webull US

webull-openapi-java-sdk 1.0.1

feat: update project description