:bulb: Release notes

• :heavy_check_mark: a24acd580267a4cd1e45ddeef7855cdfa62b08fd

  * Update 1.16.9 to 1.16.12
  * Update 1.17.6 to 1.17.8
  * Update 1.18.3 to 1.18.5
  * Bump default Kubernetes version to 1.18.5 if omitted
  

:pencil: Changelog

• 8bc0334: Prepare for releasing 20.06.0-alpha19
• fd465f3: Revert "Pass boolean arguments strictly as one value"
• f0f694e: Revert "Update Kubernetes 1.19.0-beta.0 to 1.19.0-beta.2"
• f509395: Pass boolean arguments strictly as one value
• fd81149: Update Kubernetes 1.19.0-beta.0 to 1.19.0-beta.2
• 9602b3e: Rollback 1.19.0-beta.2 to 1.19.0-beta.0 temporarily
• 09f8941: Update test pipeline to use latest Kubernetes versions
• a24acd5: Bump Kubernetes versions
• eb55cd6: install requirements CI: build missing container images if any
• 2dc6c3c: Use TTY for the release container (if any)