Fix run process become a zombie. (#293)

Author: masato-hi

runner/engine.go

@@ -434,6 +434,7 @@ func (e *Engine) runBin() error {
 	go func() {
 		_, _ = io.Copy(os.Stdout, stdout)
 		_, _ = io.Copy(os.Stderr, stderr)
+		_, _ = cmd.Process.Wait()
 	}()
 
 	killFunc := func(cmd *exec.Cmd, stdout io.ReadCloser, stderr io.ReadCloser) {