Update README (nvim-lua#832)

Author: restray

README.md

@@ -253,7 +253,7 @@ sudo apt install make gcc ripgrep unzip neovim
 ```
 sudo add-apt-repository ppa:neovim-ppa/unstable -y
 sudo apt update
-sudo apt install make gcc ripgrep unzip neovim
+sudo apt install make gcc ripgrep unzip git neovim
 ```
 </details>
 <details><summary>Debian Install Steps</summary>