Add missing DB engines (#801)

Author: wata727

rules/aws_db_instance_invalid_engine.go

@@ -24,27 +24,32 @@ func NewAwsDBInstanceInvalidEngineRule() *AwsDBInstanceInvalidEngineRule {
 		attributeName: "engine",
 		engines: map[string]bool{
 			// https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_CreateDBInstance.html#API_CreateDBInstance_RequestParameters
-			"aurora":               true,
-			"aurora-mysql":         true,
-			"aurora-postgresql":    true,
-			"mariadb":              true,
-			"mysql":                true,
-			"oracle-ee":            true,
-			"oracle-ee-cdb":        true,
-			"custom-oracle-ee":     true,
-			"custom-oracle-ee-cdb": true,
-			"oracle-se2":           true,
-			"oracle-se2-cdb":       true,
-			"oracle-se1":           true,
-			"oracle-se":            true,
-			"postgres":             true,
-			"sqlserver-ee":         true,
-			"sqlserver-se":         true,
-			"sqlserver-ex":         true,
-			"sqlserver-web":        true,
-			"custom-sqlserver-ee":  true,
-			"custom-sqlserver-se":  true,
-			"custom-sqlserver-web": true,
+			"aurora":                true,
+			"aurora-mysql":          true,
+			"aurora-postgresql":     true,
+			"mariadb":               true,
+			"mysql":                 true,
+			"oracle-ee":             true,
+			"oracle-ee-cdb":         true,
+			"custom-oracle-ee":      true,
+			"custom-oracle-ee-cdb":  true,
+			"oracle-se2":            true,
+			"oracle-se2-cdb":        true,
+			"custom-oracle-se2":     true,
+			"custom-oracle-se2-cdb": true,
+			"oracle-se1":            true,
+			"oracle-se":             true,
+			"postgres":              true,
+			"sqlserver-ee":          true,
+			"sqlserver-se":          true,
+			"sqlserver-ex":          true,
+			"sqlserver-web":         true,
+			"custom-sqlserver-ee":   true,
+			"custom-sqlserver-se":   true,
+			"custom-sqlserver-web":  true,
+			"custom-sqlserver-dev":  true,
+			"db2-ae":                true,
+			"db2-se":                true,
 		},
 	}
 }