Update installation.md

Author: JaapvanEkris

docs/installation.md

@@ -61,7 +61,7 @@ BRANCH="main"
 And change the name of the branch into one of your choosing. Save the file. You can now install the branch by running
 
 ```zsh
-/bin/bash ./install.sh
+sudo /bin/bash ./install.sh
 ```
 
 Just answer the questions from the script and OpenRowingMonitor will be installed for you completely.