Update OWNERS file
Update OWNERS file

## Reason of the change

Update owners file with https://github.com/prezi/ownership.

### Invoked with arguments
```
update '--add' 'CBS Infrastructure ownership group' '--developers' 'andras.kalman@prezi.com'
```
### Operations
```
AddOperation<teams=[CBS Infrastructure ownership group] developers=[andras.kalman@prezi.com]>
```
prezi/reverse-proxy-rate-limiter