Merge pull request #85 from carsso/patch-1

Fix small typo in documentation

Author: notheotherben

README.md

@@ -47,7 +47,7 @@ helper script.
 
 ##### Using `apt`
 ```sh
-apt update && apt upgrade -y tailscale
+apt update && apt install -y tailscale
 ```
 
 ##### Using `manage.sh`