v3.0.0-next.9

Features

• Log uncaught errors to the console with source-maps (#446)
• Respect cf.cacheKey when using the Cache API (#447)
• Add WebSocket support to fetch and Miniflare#dispatchFetch, as supported
  in Workers and Miniflare 2 (#453)
• Allow custom function service bindings to return WebSocket Responses, as
  they could in Miniflare 2 (#453)
• Allow the cf object to be customised with Miniflare#dispatchFetch (#453)
• Allow specifying port: 0 option to bind to any accessible port (#453)

Fixes

• Fix caching of ReadableStream-bodied Responses (#447)