v1.6.0

WebSockets v1.6.0

Diff since v1.5.9

Closed issues:

• Cannot support proxy? (#172)
• How to get status code from WebSocketClosedError? (#176)
• Release version 1.5.10 (#179)

Merged pull requests:

• bump HTTP compat to v1 (#177) (@rafaqz)
• compatible with HTTP [1.1.0 - 1.6.0) (#182) (@anj00)
• Cleanup prior to tag (#184) (@hustf)