No support for WatchOS

[warcupcake]

'NIOTSConnectionBootstrap' is only available in watchOS 6.0 or newer

While developing a companion app for an iOS app, the WebSocketKit package displays the issue
'NIOTSConnectionBootstrap' is only available in watchOS 6.0 or newer

To Reproduce

While working on a project using the package Web3swift, I added a target for WatchOS to discover that the package for WebSocketKit does not explicitly support watchOS

Steps to reproduce the behavior:

1. Add Web3Swfit package
2. Automatically install vapor as dependency
3. See error

Expected behavior

A clear and concise description of what you expected to happen.

Environment

• Vapor Framework version:
• Vapor Toolbox version:
• OS version:

Additional context

Add any other context about the problem here.

[0xTim]

@warcupcake if you want to add experimental support for watchOS by adding it to the manifest (https://github.com/vapor/websocket-kit/blob/main/Package.swift#L9) then feel free to do a PR!