Update conjugation to match new sentence

Author: jacobgkau

README.md

@@ -164,7 +164,7 @@ sudo systemctl restart gdm
 After logging out, click on your user and there will be a sprocket at the bottom right. Change the setting to COSMIC. Proceed to log in.
 
 ## Installing on Arch Linux
-Installing via [cosmic-session](https://archlinux.org/packages/extra/x86_64/cosmic-session/) or the [cosmic](https://archlinux.org/groups/x86_64/cosmic/) group, e.g.:
+Install via [cosmic-session](https://archlinux.org/packages/extra/x86_64/cosmic-session/) or the [cosmic](https://archlinux.org/groups/x86_64/cosmic/) group, e.g.:
 `pacman -S cosmic-session` or `pacman -S cosmic`
 
 Then log out, click on your user, and a sprocket at the bottom right shows an additional entry alongside your desktop environments. Change to COSMIC and proceed with log in.