Update README.md (nvim-lua#520)

Author: mattwyd

README.md

@@ -39,19 +39,19 @@ Neovim's configurations are located under the following paths, depending on your
 
 Clone kickstart.nvim:
 
-```sh
 # on Linux and Mac
+```sh
 git clone https://github.com/nvim-lua/kickstart.nvim.git "${XDG_CONFIG_HOME:-$HOME/.config}"/nvim
 ```
 
 
-```
 # on Windows (cmd)
+```
 git clone https://github.com/nvim-lua/kickstart.nvim.git %userprofile%\AppData\Local\nvim\ 
 ```
 
-```
 # on Windows (powershell)
+```
 git clone https://github.com/nvim-lua/kickstart.nvim.git $env:USERPROFILE\AppData\Local\nvim\ 
 ```