Add mising handleRejections in logger options

In the future this should extend from a subset of `TransportStream` in https://github.com/winstonjs/winston-transport/blob/master/index.d.ts

Author: t-moennich

index.d.ts

@@ -83,6 +83,7 @@ declare namespace winston {
     defaultMeta?: any;
     transports?: Transport[] | Transport;
     handleExceptions?: boolean;
+    handleRejections?: boolean;
     exceptionHandlers?: any;
   }