Support a file list as SRC

[louie007]

Hi @davies, thanks for sharing this great tool juicesync !
I'm wondering if you can add a new feature like supporting a plain text file as SRC ?

eg.
s3://bucket1/file1
oss://buckert2/Dir1/
etc

[davies]

Right now, you can use xargs

cat mylist.txt | xargs -I{}  juicesync {} DST