Merge branch 'master' into update-go-version-1017

Author: igungor

README.md

@@ -454,6 +454,14 @@ cp s3://bucket/prefix/index.html index.html
 cp s3://bucket/prefix/test.html test.html
 ```
 
+We don't support syncing between 2 storage endpoints out of the box. The current solution is to sync remote objects to your local disk first, then sync your local files to the target remote storage. For example, if you'd like to sync S3 and Google Cloud Storage:
+
+```
+s5cmd sync 's3://s3-bucket/path/*' download_folder/
+
+s5cmd --endpoint-url <gcs-endpoint> sync 'download_folder/*' s3://gcs-bucket/path/
+```
+
 ##### Strategy
 ###### Default
 By default `s5cmd` compares files' both size **and** modification times, treating source files as **source of truth**. Any difference in size or modification time would cause `s5cmd` to copy source object to destination.