Update istio.RELEASE to 0.3.0 (#1083)
Update istio.RELEASE to 0.3.0 (#1083)

Automatic merge from submit-queue

Update istio.RELEASE to 0.3.0

```release-note
none
```
sebrandon1/istio,sebrandon1/istio,sebrandon1/istio,sebrandon1/istio