Update README.md

In Recent version of usbmount MountFlags=shared has no effect. PrivateMounts=no will do the trick. systemd/systemd#9873
OctoPrint · Feb 17, 2020 · 98a8948 · 98a8948
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diff --git a/README.md b/README.md
@@ -173,6 +173,7 @@ Once installed, usbmount requires some tweaking to make it work well on the Rasp
    Insert these lines then save and close the file:
    ```
    [Service]
+   PrivateMounts=no
    MountFlags=shared
    ```