Matching method call 

Hi! I am coming from Atom's language-python.

We need to be able to detect a method call (the priority now) or object property access. How can we do this using tree-sitter?

```py
import json
obj = 1234

json.dumps( )
#         ^meta.method-call.python
```


I have an on-going pull request which tries to do this.
https://github.com/atom/language-python/pull/325

