Fix typo in Arch Linux AUR installation. (#602)

Git clones the "neovide-git" folder from the AUR, but cd changes the current directory to "neovide" instead of "neovide-git".

README.md

@@ -147,7 +147,7 @@ There is an [AUR package for neovide](https://aur.archlinux.org/packages/neovide
 
 ```sh
 git clone https://aur.archlinux.org/neovide-git.git
-cd neovide
+cd neovide-git
 makepkg -si
 ```
 Note: Neovide requires that a font be set in `init.vim` otherwise errors might be encountered.