add image to styled git log

Author: Alex Warhawk

README.md

@@ -279,6 +279,8 @@ $ git status -sb
 $ git log --all --graph --decorate --oneline --abbrev-commit
 ```
 
+![git log --all --graph --decorate --oneline --abbrev-commit](http://i.imgur.com/RUPycwI.png)
+
 ## Git Query
 
 A git query allows you to search all your previous commit messages and finds the most recent one matching the query.