document how to download development and nightly builds #120
Description
It took some trial and error for me to figure out how to take a url from swift.org and translate it into the right arguments to swift-sdk-generator. For example:
https://download.swift.org/swift-6.0-branch/xcode/swift-6.0-DEVELOPMENT-SNAPSHOT-2024-08-20-a/swift-6.0-DEVELOPMENT-SNAPSHOT-2024-08-20-a-osx.pkg
--swift-branch swift-6.0-branch
--swift-version 6.0-DEVELOPMENT-SNAPSHOT-2024-08-20-a