Results 3 issues of Quan Nguyen

Right now, when working with 3 parsers combined together, the resulting type of the combined parser is `Any`. For instance, ```python from typing import reveal_type from funcparserlib.parser import a expr...

A draft implementation for issue #80

## 🐛 Bug Hi, I'm trying to download wikitext datasets using torchtext APIs but facing with an error: ``` --------------------------------------------------------------------------- HTTPError Traceback (most recent call last) [](https://localhost:8080/#) in () 20...