HTTP Method is wrong

Python 3.6
http-parser 0.8.3

```python
from http_parser.http import HttpStream, HTTP_REQUEST
from io import BytesIO

stream = HttpStream(BytesIO(b"GET /admin HTTP/1.1\r\n\r\n"), kind=HTTP_REQUEST)
```

This will raise AssertError

```python
assert stream.method() == "GET" # DELETE
assert stream.url() == "/admin"
```
This is correct

```python
assert stream.url() == "/admin"
assert stream.method() == "GET"
```

Start by running the provided Python 3.6 reproduction with http-parser 0.8.3 and inspect how HttpStream.method() handles the request line. Confirm that the method is reported as GET for the shown input, while stream.url() remains /admin; the issue is done when the assertions pass.

Scritto dal modello di indicizzazione a partire dal testo della issue.