destroyed
* [@types/node] add `destroyed` property for Readable and Writable 1. https://nodejs.org/dist/latest-v12.x/docs/api/stream.html#stream_readable_destroyed 2. https://nodejs.org/dist/latest-v12.x/docs/api/stream.html#stream_writable_destroyed * [@types/node] add test for readable.destroyed/writable.destroyed 1. Property 'destroyed' is missing in type 'WriteStream' but required in type 'Writable' 2. check `destroyed` * fixed: replace Readable with ReadableStream
