make --squash optional and add note about when to use it

docs/install.md

@@ -192,11 +192,11 @@ rc-service foundkey start
 You can check if the service is running with `rc-service foundkey status`.
 
 ### Updating FoundKey
-When a new release comes out, simply fetch and merge in the new tag. Here we opt to squash upstream commits as it allows for easy reverts in case something goes wrong.
+When a new release comes out, simply fetch and merge in the new tag. If you plan on making additional changes on top of that tag, we suggest using the `--squash` option with `git merge`.
 ```sh
 git fetch -t
-git merge tags/v13.0.0-preview2 --squash
+git merge tags/v13.0.0-preview2
-  # you are now on the "next" release
+# you are now on the "next" release
 ```
 
 Now you'll want to update your dependencies and rebuild: