5.21.2 release

1. Add spot cross margin API support
2. Add spot order operations using cross margin account
3. Withdrawal supports cancelling
4. Futures positions supports updating cross margin leverage
5. Add interest in spot margin account response

4.15.3 Release

1. Add missing field in Contract model
2. Fix document issues

Initial release

4.15.2 brings our brand new NodeJS SDK which is targeting towards node applications only(no intended support for browsers).
We utilize TypeScript to add type hints and axios to provide Promise-based API calls.