Feature - optionally include Error.cause property

Author: Alexandra Tudor

lib/winston/logger.js

@@ -248,6 +248,7 @@ class Logger extends Transform {
 
         if (meta.message) info.message = `${info.message} ${meta.message}`;
         if (meta.stack) info.stack = meta.stack;
+        if (meta.cause) info.cause = meta.cause;
 
         this.write(info);
         return this;