colinjfw/gq: graph/traverser.go; 9 LoC

Found a possible issue in [colinjfw/gq](https://www.github.com/colinjfw/gq) at [graph/traverser.go](https://github.com/colinjfw/gq/blob/9df38f7355ace537ffd8650cac9fdc51b446d1e2/graph/traverser.go#L86-L94)

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 ch used in defer or goroutine at line 89

[Click here to see the code in its original context.](https://github.com/colinjfw/gq/blob/9df38f7355ace537ffd8650cac9fdc51b446d1e2/graph/traverser.go#L86-L94)

Click here to show the 9 line(s) of Go which triggered the analyzer.

```go
for _, ch := range chans {
wg.Add(1)
go func() {
for o := range ch {
out <- o
}
wg.Done()
}()
}

```

Leave a reaction on this issue to contribute to the project by classifying this instance as a **Bug** :-1:, **Mitigated** :+1:, or **Desirable Behavior** :rocket:
See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: 9df38f7355ace537ffd8650cac9fdc51b446d1e2

Start by reading graph/traverser.go at lines 86-94 and inspect how the goroutines consume chans. Run the project's relevant Go tests or analyzer if available; done means the reported range-loop capture warning is addressed without changing traversal behavior.

Written by the indexing model from the issue text.