Coturn 4.5.2

• Fix null pointer dereference in case of out of memory
• Add prometheus metrics
• Delete trailing whitespace in example configuration files
• Add architecture ppc64le to travis build
• Fix misleading option in doc (prometheus)
• Allow RFC6062 TCP relay data to look like TLS
• Add support for proxy protocol V1
• Print full date and time in logs
• Add new options: "new-log-timestamp" and "new-log-timestamp-format"
• Do not use FIPS and remove hardcode OPENSSL_VERSION_NUMBER with LibreSSL
• Add ACME redirect url
• Support of --acme-redirect <URL>
• Fix acme security, redundancy, consistency
• Disable binding request logging to avoid DoS attacks (Breaking change!)
  • Add new --log-binding option to enable binding request logging
• Fix stale-nonce documentation
• Version number is changed to semver 2.0
• pkg-config, and various cleanups in configure file
• Add systemd notification for better systemd integration
• Fix: Null pointer dereference on tcp_client_input_handler_rfc6062data function
• Fix: use-after-free vulnerability on write_to_peerchannel function
• Fix: use-after-free vulnerability on write_client_connection function
• Little refactoring prometheus
  • Fix c++ support
  • Simplify
    • Remove session id/allocation labels
    • Remove per session metrics
• Fix CVE-2020-26262
  • Fix ipv6 ::1 loopback check
  • Not allow allocate peer address 0.0.0.0/8 and ::/128
  • For more details see the github security advisory: https://github.com/coturn/coturn/security/advisories/GHSA-6g6j-r9rf-cm7p