fix #173: unhandled rejections should not force the process to exit

Author: 1999

src/subprocess/runner.ts

@@ -22,13 +22,10 @@ import {
   applyRequires,
   applyTimeouts,
   randomId,
-  setProcessExitListeners,
 } from '../util';
 
 import applyExit from './options/exit';
 
-setProcessExitListeners();
-
 const argv = yargs
   .boolean('bail')
   .option('compilers', {