fix: 修复 ci 报错

.gitignore

@@ -23,4 +23,5 @@ _site
 dist
 coverage
 *.log
-lib
+lib
+yarn.lock

package.json

@@ -1,6 +1,6 @@
 {
   "name": "atool-test-mocha",
-  "version": "0.1.7",
+  "version": "0.1.8",
   "description": "Unit testing tool based on mocha & sinon & chai, run tests with jsdom",
   "keywords": [
     "testing",

src/index.js

@@ -42,6 +42,10 @@ export default function(config) {
     stdio: 'inherit',
   });
 
+  cp.on('close', (code) => {
+    process.exit(code);
+  });
+
   cp.on('exit', () => {
     if (config.coverage) {
       console.log();