fixes mochajs#4994 - Preserves error.name during serialization process so type of error can be used by reporters who differentiate between failed tests and broken tests, such as allure-mocha

Author: jamesmortensen

lib/nodejs/serializer.js

@@ -204,7 +204,8 @@ class SerializableEvent {
       value = Object.assign(Object.create(null), value, {
         stack: value.stack,
         message: value.message,
-        __type: 'Error'
+        __type: 'Error',
+        name: value.name
       });
       parent[key] = value;
       // after this, set the result of type(value) to be `object`, and we'll throw