No message when sync does not need to do anything

[larkost]

Currently if you execute a s5cmd sync s3://somthing somewhere and the file is already in-sync you will get no output at all. If it needs to copy it you will get the cp output. For my use case I would like to be able to positively assert that everything is there, and so I would like to request some sort of status message indicating that the file was already synced.

Effectively I would like a single line of output for every file that s5cmd winds up ensuring is transferred/synced.