ic-push-params: multiple GET parameters with same name cannot be pushed to URL

## Expected Behavior
It would be expected when using `ic-push-params` with multiple checked input type checkbox, that multiple get paramaters with the same names are being pushed to the URL, for example when two countries are checked: `&countries=russia&countries=ukraine`

## Current Behavior
Only one of multiple checked inputs shows up in the URL, in the above example: `&countries=ukraine` (but both values are in the request and can be evaluated on server side).