Make `golang` an alias for `go` in code snippets

[mtlynch]

Minor feature request. It would be good if CodeApprove did syntax highlighting for both golang and go language quotes in fenced code snippets. Currently, only go works.

By comparison, on Github, both golang and go get syntax highlighting:

var s string
if true {
  s := "Hello, world!"
}

var s string
if true {
  s := "Hello, world!"
}

[samatcodeapprove]

@mtlynch thanks for noticing! Should be a very quick fix

[samatcodeapprove]

Pushing this now!

[mtlynch]

Awesome, thanks!