how to listen:
```
local function register_events(event)
script.on_event(remote.call("se-core-miner-efficiency-updated-event", "on_efficiency_updated"), function(event)
log(serpent.block(event))
end)
end
script.on_init(register_events)
script.on_load(register_events)
```
what you get:
```
{
surface_index = 1,
zone_index = 523,
new_amount_for_one = 478148.66421992512,
new_amount = 2138345.833092948,
efficiency = 0.22360679774997898,
}
```
