Fixed a markdown error

README.md

@@ -24,10 +24,11 @@ git clone git@github.com:jisaacks/GitGutter.git
 ```
 
 *Windows*
+
 GitGutter assumes that the `git` and `diff` command is availible on the command line. Since the MSI installer for Git on Windows only adds the `cmd` directory of your Git installation to the `PATH` environment variable by default, GitGutter may not work out of the box. In this case you have to add the `bin` directory of your Git installation to the `PATH` environment variable.
 
 For example:
-```shell
+```dos
  %PATH%;C:\Program Files (x86)\Git\bin;C:\Program Files (x86)\Git\cmd
 ```