Update upgrade.md

Explains that it is recommended, but not required, to upgrade one minor version at a time.
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John Ruiz 2018-02-12 17:54:19 -05:00 committed by GitHub
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@ -38,5 +38,6 @@ Upgrade uses the latest Kubernetes version considered stable by kops, defined in
* `terraform apply`
* `kops rolling-update cluster $NAME` to preview, then `kops rolling-update cluster $NAME --yes`
### Other Notes:
* In general, we recommend that you upgrade your cluster one minor release at a time (1.7 --> 1.8 --> 1.9). Although jumping minor versions may work if you have not enabled alpha features, you run a greater risk of running into problems due to version deprecation.