fixed readme
fixed readme

praxik/s3_multipart,michaelkeenan/s3_multipart,praxik/s3_multipart,michaelkeenan/s3_multipart,praxik/s3_multipart,michaelkeenan/s3_multipart,maxgillett/s3_multipart,mihserf/s3_multipart,nickstamas/s3-multipart,maxgillett/s3_multipart,maxgillett/s3_multipart,mihserf/s3_multipart,nickstamas/s3-multipart,mihserf/s3_multipart