Update installation.md

Author: codeperfectplus

src/docs/installation.md

@@ -1,6 +1,7 @@
 ## Installation 🛠️
 
 ```bash
+sudo apt-get update
 wget https://raw.githubusercontent.com/codeperfectplus/SystemGuard/production/setup.sh
 chmod +x setup.sh && sudo mv setup.sh /usr/local/bin/systemguard-installer
 ```
@@ -76,4 +77,4 @@ It will install the SystemGuard app and its dependencies in the crontab and it w
 # install miniconda3 if not installed already
 wget https://raw.githubusercontent.com/codeperfectplus/HackScripts/main/setup/install_miniconda.sh
 chmod +x install_miniconda.sh && sudo ./install_miniconda.sh
-```
+```