Fix a error Markdown format in Aliases section

doggy8088 · web-flow · commit e59dac618920 · 2018-05-01T15:50:42.000+08:00
This commit fixes tiimgreen#187
diff --git a/README.md b/README.md
@@ -967,7 +967,7 @@ Some useful aliases include:
 | `git st` | `git status -sb` | `git config --global alias.st 'status -sb'` |
 | `git tags` | `git tag -l` | `git config --global alias.tags 'tag -l'` |
 | `git branches` | `git branch -a` | `git config --global alias.branches 'branch -a'` |
-| `git cleanup` | `git branch --merged | grep -v '*' | xargs git branch -d` | `git config --global alias.cleanup "!git branch --merged | grep -v '*' | xargs git branch -d"` |
+| `git cleanup` | `git branch --merged` &#124; `grep -v '*'` &#124; `xargs git branch -d` | `git config --global alias.cleanup "!git branch --merged` &#124; `grep -v '*'` &#124; `xargs git branch -d"` |
 | `git remotes` | `git remote -v` | `git config --global alias.remotes 'remote -v'` |
 | `git lg` | `git log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --` | `git config --global alias.lg "log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit --"` |
 
