ResourceWarning: unclosed socket

[elopio]

Hello!

I'm getting a warning about the socket being unclosed. I'm using requests_unixsocket.Session() in a context manager, so I was expecting it to be closed for me.

To reproduce:

$ python3
>>> import requests_unixsocket
>>> import warnings
>>> warnings.simplefilter('default')
>>> with requests_unixsocket.Session() as session:
...    snap_info = session.get('http+unix://%2Frun%2Fsnapd.socket/v2/snaps/core')
... 
__main__:2: ResourceWarning: unclosed <socket.socket fd=4, family=AddressFamily.AF_UNIX, type=SocketKind.SOCK_STREAM, proto=0, raddr=/run/snapd.socket>

$ lsb_release -d
Description:    Ubuntu 16.04.3 LTS
$ python3 --version
Python 3.5.2
$ pip list | grep requests-unixsocket
requests-unixsocket (0.1.5)