Log Message:
py-s3transfer: updated to 0.4.2

0.4.2

enhancement:s3: Add support for ExpectedBucketOwner.
0.4.1

enhancement:crt: Add set_exception to CRTTransferFuture to allow setting \ 
exceptions in subscribers.
0.4.0

feature:crt: Add optional AWS Common Runtime (CRT) support. The AWS CRT provides \ 
a C-based S3 transfer client that can improve transfer throughput.