oskanberg/olson-model: main.go; 43 LoC

Found a possible issue in [oskanberg/olson-model](https://www.github.com/oskanberg/olson-model) at [main.go](https://github.com/oskanberg/olson-model/blob/b2c740b234e9defc8d47036f53d0c2bf823573c8/main.go#L87-L129)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first
issue it finds, so please do not limit your consideration to the contents of the below message.

> range-loop variable prd used in defer or goroutine at line 123

[Click here to see the code in its original context.](https://github.com/oskanberg/olson-model/blob/b2c740b234e9defc8d47036f53d0c2bf823573c8/main.go#L87-L129)

Click here to show the 43 line(s) of Go which triggered the analyzer.

```go
for _, prd := range s.predators {
predatorGenome = prd.GetGenome()
wg.Add(1)
go func() {
simulation := NewSimulation()
for i := 0; i < NumberOfPredatorClones; i++ {
simulation.AddPredatorFromGenome(predatorGenome)
}

for _, pry := range s.prey {
preyGenome = pry.GetGenome()
for i := 0; i < NumberOfPreyClones; i++ {
simulation.AddPreyFromGenome(preyGenome)
}

for i := 0; i < RoundsPerGeneration; i++ {
simulation.Simulate(TotalSimulationSteps)
simulation.ResetPopulation()
}

// copy prey fitness back
var newFitness int
for _, sPry := range simulation.GetPrey() {
newFitness += sPry.GetFitness()
}
newFitness = newFitness / NumberOfPreyClones
// fmt.Println("prey updating with fitness", newFitness)
pry.fitness = newFitness

newFitness = 0
for _, sPrd := range simulation.GetPredators() {
newFitness += sPrd.GetFitness()
}
newFitness = int(math.Ceil(float64(newFitness) / float64(NumberOfPredatorClones)))
// fmt.Println("predator updating with fitness", newFitness)
// += to other prey adversaries
prd.fitness += newFitness
meanNearbyPrey += simulation.meanNearbyPrey
}
// prd.fitness /= len(s.prey)
wg.Done()
}()
}

```

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See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: b2c740b234e9defc8d47036f53d0c2bf823573c8