Fix preExtendEvent callback errs param in dispatch func

[shazichuanshuo]

DESCRIPTION

The issue here is if there is error happened in the pre event extender, the callback will happen with param name err. However the code in the denormalizer dispatch func call it with [errs] which will cause ReferenceError.

STEPS

1. Define an pre event extender as

   module.exports = require('cqrs-eventdenormalizer').definePreEventExtender({
   name: 'testCreated',
   aggregate: 'test',
   context: 'core'
   }, function(evt, col, callback) {
   callback(new Error('This is a test'), evt);;
   });

2. Call the denormalizer dispatch

EXPECTED

Handle the error gracefully

OBSERVATIONS

"ReferenceError: errs is not defined.

[adrai]

very nice, thx

[adrai]

v1.16.2