delete cmd may not handle properly?

[saggit]

Hi, thanks for the great bridge, I try to consumer example, it works as expect without print the response, the message was delete in the queue, however, the response is Err(RequestError),

with a a little dig, I found the response static string is missing for DELETED.

btw, I am using the beanstalk with version beanstalkd 1.10 on macos,