Added whatsnew entry for new code completion.
Added whatsnew entry for new code completion.

math-foo/cloudpebble,pebble/cloudpebble,pebble/cloudpebble,thunsaker/cloudpebble,pebble/cloudpebble,thunsaker/cloudpebble,math-foo/cloudpebble,pebble/cloudpebble,pebble/cloudpebble,thunsaker/cloudpebble,thunsaker/cloudpebble,math-foo/cloudpebble,math-foo/cloudpebble