region code does not match

RegionAntarctica
[here](https://github.com/biter777/countries/blob/4fa48089b8b87a1ddbe43757958466d127c1fbef/regionsconst.go#L39)
```go
// RegionAntarctica   RegionCode = 10
RegionAntarctica RegionCode = 999
```