Update README.md

README.md

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 One-liner installer for [Apache CloudStack](https://cloudstack.apache.org), just copy and run the following as `root` user:
 
 ```bash
-curl -sSfL https://c8k.in/stall.sh | bash
+curl -sL https://c8k.in/stall.sh | bash
 ```
 
 > [!IMPORTANT]