fix: change property of handleRejections (#1779)

change property handleExeptions with handleRejections to make it works

lib/winston/rejection-handler.js

@@ -150,7 +150,7 @@ module.exports = class RejectionHandler {
    */
   _addHandler(handler) {
     if (!this.handlers.has(handler)) {
-      handler.handleExceptions = true;
+      handler.handleRejections = true;
       const wrapper = new ExceptionStream(handler);
       this.handlers.set(handler, wrapper);
       this.logger.pipe(wrapper);