Navigate back may not work properly when disable native-PJAX-mode

[EnixCoda]

In #239 , I was unable to reproduce the issue when I got time to take a deeper look. So as an alternative solution, the Native PJAX mode support was released. And now GitHub does roll out the new redirection strategy again. Gitako would disappear after redirecting and disabling Native PJAX mode fixes that.

However, another issue arose, if you

1. navigate to a file with Gitako
2. click Issues
3. click browser's back button, page content may not update

This time, I'll look for a better solution.

[EnixCoda]

Fixed in v3.7.3