apitools.dev links in README.md broken

Multiple links in the README.md point to a `docs` path in apitools.dev:
```
[Resolves](https://apitools.dev/swagger-parser/docs/swagger-parser.html#resolveapi-options-callback)
```

These should instead be `https://apitools.dev/swagger-parser/swagger-parser.html` - there is no `docs` in the correct URLs.
