chore!: remove deprecated usage of pino.child (#1902)

Author: mmarchini

lib/plugins/audit.js

@@ -260,11 +260,15 @@ function auditLogger(opts) {
 
     var serializers = Object.assign({}, DEFAULT_SERIALIZERS, opts.serializers);
 
-    var log = opts.log.child({
-        audit: true,
-        component: opts.event,
-        serializers: serializers
-    });
+    var log = opts.log.child(
+        {
+            audit: true,
+            component: opts.event
+        },
+        {
+            serializers: serializers
+        }
+    );
 
     function audit(req, res, route, err) {
         var latency = res.get('Response-Time');

lib/plugins/requestLogger.js

@@ -66,7 +66,11 @@ function requestLogger(options) {
                 props[k] = req.headers[k];
             }
         });
-        req.log = log.child(props, props.serializers ? false : true);
+        const childOptions = {};
+        if (props.serializers) {
+            childOptions.serializers = props.serializers;
+        }
+        req.log = log.child(props, childOptions);
 
         if (props.req_id) {
             delete props.req_id;