Add end method to ChunkedStreamDecoder for compatibility with Response

[WyriHaximus]

Fixes #61

[clue]

👎 This class implements the ReadableStreamInterface, while the end() method is only defined on the WritableStreamInterface. I'm aware of #61, but why is this method called in the first place?

[WyriHaximus]

end() is called because the stream coming into Response is a DuplexStreamInterface and close() kills off the response with an exception.

Another option to this issue is to check if $this->stream implements WritableStreamInterface before calling end().

[clue]

I've just checked the Response class, afaict it actually violates the stream interface by calling end() within its close() method, so I think this should be fixed.

Also, afaict it doesn't really make sense this expects a DuplexStreamInterface in the first place, as it's only using its read-only side anyway. We should be able to change this to a ReadableStreamInterface without causing a BC break (Liskov substitution principle).

I'd vote for closing this one to keep this discussion and vote for somebody to file a new PR that fixes this in the Response instead 👍

[WyriHaximus]

That makes even more sense, I'll close this PR and file a new PR shortly with the suggested change 👍 .