v1.8.0-rc.4

Release v1.8.0-rc.4

Changes:

• Biganimal module - handle alt postgres engine names
  • pg -> postgres
  • pge -> pgextended

Fixes:

• Biganimal module - ignore cluster does not exist errors during terraform destroy

Full Changelog: v1.8.0-rc.3...v1.8.0-rc.4