Update releases.md and alpha channel for 1.18.0 release#9669

Merged

k8s-ci-robot merged 1 commit intokubernetes:masterfrom johngmyers:new-minor

Aug 3, 2020

+7-7

Commits on Aug 3, 2020

Update releases.md and alpha channel for 1.18.0 release
johngmyers
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