v0.18.0

• Add Postgres 12 support
• Process each configured server section in parallel
  • This avoids problems when a high number of servers is configured, since
    previously they would be processed serially, leading to skewed statistics
    for servers processed later in the sequence
• Introduce log filtering for PII and other kinds of secrets
  • This is controlled by the new "filter_log_secret" configuration setting
• Remove explicit connection to EC2 metadata service #27
• Gather total partitioned/inheritance children table size
• Correctly retrieve distributed table size for Citus extension tables
• Ensure connections are encrypted and made using TLS 1.2
• Build improvements
  • Update builds and tests to use Go 1.12
  • Switch to new Go module system instead of gvt