Arch Linux

Description:

`mitmproxy` is broken due to not supporting the latest release of `python2-netlib`

Additional info:
* mitmproxy
* python2-netlib 0.13.1 (works)
* python2-netlib 0.14.0 (fails)

Steps to reproduce:

1. Install latest `mitmproxy`.
2. Install latest `python2-netlib`.
3. Try to run `mitmproxy`. Observe the following error:

```
$ sudo mitmproxy
Traceback (most recent call last):
File "/usr/bin/mitmproxy", line 5, in <module>
from pkg_resources import load_entry_point
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3095, in <module>
@_call_aside
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3081, in _call_aside
f(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3108, in _initialize_master_working_set
working_set = WorkingSet._build_master()
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 660, in _build_master
return cls._build_from_requirements(__requires__)
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 673, in _build_from_requirements
dists = ws.resolve(reqs, Environment())
File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 846, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'netlib<0.14,>=0.13' distribution was not found and is required by mitmproxy
```

Workaround: Downgrade python2-netlib to 0.13.1.