Clarify the support status of NIO1 (#1949)
Clarify the support status of NIO1 (#1949)

Motivation:

It's currently unclear that SwiftNIO1 is end of life.

Modifications:

Update the README to set a deadline on patches to NIO1

Result:

Everyone knows where the core team stands on supporting NIO1

Co-authored-by: George Barnett <59b0e56879b86da0e981488bfde94fba55775ec7@apple.com>
apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio