RouteTableDef can't register OPTIONS request handlers

🐞 **Describe the bug**
Currently it gives an AttributeError: 'RouteTableDef' object has no attribute 'options'

💡 **To Reproduce**

```py
@route.options('/path')
def opts(request):
   ...
```

💡 **Expected behavior**
It should register decorated function as the OPTIONS request handler for that path