Unhandle exceptions and rejections B4 replacement

Attempts to address [comment](#1824 (comment)) by @unconfident

Author: wbt

lib/winston/logger.js

@@ -107,6 +107,12 @@ class Logger extends Transform {
     // Hoist other options onto this instance.
     this.levels = levels || this.levels || config.npm.levels;
     this.level = level;
+    if(typeof logger.exceptions !== 'undefined') {
+      logger.exceptions.unhandle();
+    }
+    if(typeof logger.rejections !== 'undefined') {
+      logger.rejections.unhandle();
+    }
     this.exceptions = new ExceptionHandler(this);
     this.rejections = new RejectionHandler(this);
     this.profilers = {};