v2.2.0 Release

New Features

• New
  • /contract/private/trade-fee-rate Support querying trade fee rate(KEYED)

Improvements

• Add API_V2_URL=https://api-cloud-v2.bitmart.com
• The default URL of the client APIContract is changed to API_V2_URL
• Optimize websocket
  • Remove CloudWSClient and CloudWSContractClient
  • Remove websockets dependency
  • The ping/pong mechanism of the spot websocket has been modified to support ping text