There are some URLs this validates and are wrong - e.g. "https://https://www.google.com" - this should be invalid

```
# TODO: There are some URLs this validates and are wrong - e.g. "https://https://www.google.com" - this should be invalid
```

https://github.com/mlspec/mlspec-lib/blob/51eadf473c6561b2cb750185e142638e09922c2a/mlspeclib/util.py#L19