Fix typo

Author: DABH

lib/winston/rejection-handler.js

@@ -12,7 +12,7 @@ const asyncForEach = require('async/forEach');
 const debug = require('@dabh/diagnostics')('winston:rejection');
 const once = require('one-time');
 const stackTrace = require('stack-trace');
-const ExceptionStream = require('./exception-stream');
+const RejectionStream = require('./rejection-stream');
 
 /**
  * Object for handling unhandledRejection events.