docs(cn): translate content/blog/2018-06-07-you-probably-dont-need-de…

…rived-state.md into Chinese (#168)

* 翻译完成

* 翻译改进

1 把译注放在文章下面
2 翻译之后的行和原文的行保证一致

* change format

* change title

* change some words

* change words

* delete some whitespaces

* fix commit error

* fix props