README: Docker version note

2019-12-08 00:10:40 +01:00 · 2019-12-08 00:10:40 +01:00 · 6085f5fc03
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@ -32,6 +32,8 @@ Automatically detects and backs up volumes, mysql, mariadb and postgres database
 * Databases are backed up from stdin / dumps into restic using path `/databases/<service_name>/dump.sql`
 * Cron triggers backup at 2AM every day

+Currently tested with docker-ce 17, 18 and 19.
+
 ## Install

 ```bash