install: fix script used (#703)

Signed-off-by: Patrick Stephens <[email protected]>

Author: Pat

installation/linux/README.md

@@ -4,7 +4,7 @@ A simple installation script is provided to be used for most Linux targets.
 This will always install the most recent version released.
 
 ```bash
-curl https://raw.githubusercontent.com/fluent/fluent-bit/master/update_version.sh | sh
+curl https://raw.githubusercontent.com/fluent/fluent-bit/master/install.sh | sh
 ```
 
 If this fails or for more details on the installation then please refer to the specific section for your OS.