change [aliases] to [alias] (#136)

* change [aliases] to [alias]

Titling the section `aliases` did not work for me. Changing to `[alias]` worked immediately.

Reference: https://git-scm.com/docs/git-config#git-config-alias

* Update README_zh-cn.md

README.md

@@ -960,10 +960,10 @@ If you want to revert to changes made just 1 commit before c5f567, pass the comm
 <a name="adding-command-aliases"></a>
 ### I want to add aliases for some git commands
 
-On OS X and Linux, your git configuration file is stored in ```~/.gitconfig```.  I've added some example aliases I use as shortcuts (and some of my common typos) in the ```[aliases]``` section as shown below:
+On OS X and Linux, your git configuration file is stored in ```~/.gitconfig```.  I've added some example aliases I use as shortcuts (and some of my common typos) in the ```[alias]``` section as shown below:
 
 ```vim
-[aliases]
+[alias]
     a = add
     amend = commit --amend
     c = commit

README_zh-cn.md

@@ -916,10 +916,10 @@ $ git update-ref refs/tags/<tag_name> <hash>
 <a name="adding-command-aliases"></a>
 ### 我想给一些Git命令添加别名(alias)
 
-在 OS X 和 Linux 下, 你的 Git的配置文件储存在 ```~/.gitconfig```。我在```[aliases]``` 部分添加了一些快捷别名(和一些我容易拼写错误的)，如下:
+在 OS X 和 Linux 下, 你的 Git的配置文件储存在 ```~/.gitconfig```。我在```[alias]``` 部分添加了一些快捷别名(和一些我容易拼写错误的)，如下:
 
 ```vim
-[aliases]
+[alias]
     a = add
     amend = commit --amend
     c = commit