ERG Update 0.0.40

Great to see that the latest update seems to have fixed the ERG issue - I've just riden on The Sufferfest and been able to hold <100w at 100 cadence with no problems - power tracking in ERG mode seemed better too with less "chasing" the targets outputs.

The fans not working at low wattage caught me out, I think a lot of people are going to think something's wrong there, but I guess it's necessary to be able to do low resistance in ERG mode (as the fans themselves will require a certain minimum amount of power to be generated)

The bug whereby the bike seemed to report approx double virtual speed/distance in ERG mode also seems to have been fixed.

Oddly, in ERG mode you can now change gear, which considering the gears are entirely simulated seems pointless and really threw me (nearly literally) when I accidentally changed down on the big ring during a sprint.