jsonnet-lint missing std.reverse

`std.reverse` is missing from the linter

And has a confusing error message

```
➜ jsonnet-lint a.jsonnet
a.jsonnet:1:1-12 Indexed object has no field "reverse"

std.reverse(['a', 'b'])


a.jsonnet:1:1-24 Called value must be a function, but it is assumed to be void

std.reverse(['a', 'b'])


Problems found!
```