List Postgres RDS to be upgraded

rds-postgres-specific-version.yml

policies:
 - name: list_specific-postgres-rds
   resource: rds
   filters:
     - type: value
       key: "Engine"
       op: equal
       value: postgres
     - type: value
       key: "EngineVersion"
       op: not-in
       value: ['9.4.20', '9.5.15', '9.6.11', '10.6']
   description: |
    List all RDS Postgres instance that not version 9.4.20, 9.5.15, 9.6.11, and 10.6
    Run command..
      custodian run -s output \
      -r all \
      --cache-period 0 \
      -p list_specific-postgres-rds \
      -d \
      rds/rds-postgres-specific-version.yml
    Report command..
      custodian report -s output \
      -r all \
      -p list_specific-postgres-rds \
      --no-default-fields \
      --field "DBInstanceIdentifier=DBInstanceIdentifier" \
      --field Region=region \
      --field "EngineVersion=EngineVersion" \
      --field "MultiAZ=MultiAZ" \
      --field "ProductDomain=tag:ProductDomain" \
      --field "PendingUpdate=PendingModifiedValues" \
      --field "AllocatedStorage=AllocatedStorage" \
      --field "MaintenanceWindowTime=PreferredMaintenanceWindow" \
      rds/rds-postgres-specific-version.yml > csv/rds-postgres-specific-version.csv