Added support for ClickHouse v19.15

fix push docker release and update readme

up to go1.13

Improvenents

check that table is created before restore-data was added
support comma list for 'table' flag was added

improve env

Merge branch 'master' of github.com:AlexAkulov/clickhouse-backup

Fixed process of the retrieving aws credentials (Altinity#29)

bug that delete the newest backups has been fixed

Improve performance for upload and download. Improve progress bar.

improve readme