fix(gulp-tasks): add exit in mocha to close mocha when test pass

Author: Walker Leite

template/gulp-tasks/test.js

@@ -12,6 +12,7 @@ gulp.task(
       .pipe(mocha({
         compilers: 'js:babel-core/register',
         require: path.resolve(dirs.test, 'mocha.conf.js'),
+        exit: true,
       }))
 );