praw 3 requests dependency version

[michael-lazar]

Issue Description

In PRAW 3, the setup.py file pins the requests version at 'requests >=2.3.0'. However, actually trying to use requests v2.3.0 will raise an exception. The problem is that the merge_environment_settings method wasn't added until v2.4.0.

  File "/usr/local/lib/python3.4/dist-packages/praw/__init__.py", line 1522, in refresh_access_information
    refresh_token=refresh_token or self.refresh_token)
  File "<decorator-gen-11>", line 2, in refresh_access_information
  File "/usr/local/lib/python3.4/dist-packages/praw/decorators.py", line 294, in require_oauth
    return function(*args, **kwargs)
  File "/usr/local/lib/python3.4/dist-packages/praw/__init__.py", line 745, in refresh_access_information
    retval = self._handle_oauth_request(data)
  File "/usr/local/lib/python3.4/dist-packages/praw/__init__.py", line 657, in _handle_oauth_request
    response = self._request(url, auth=auth, data=data, raw_response=True)
  File "/usr/local/lib/python3.4/dist-packages/praw/__init__.py", line 451, in _request
    response = handle_redirect()
  File "/usr/local/lib/python3.4/dist-packages/praw/__init__.py", line 432, in handle_redirect
    verify=self.http.validate_certs, **kwargs)
  File "/usr/local/lib/python3.4/dist-packages/praw/handlers.py", line 138, in wrapped
    return function(cls, **kwargs)
  File "/usr/local/lib/python3.4/dist-packages/praw/handlers.py", line 56, in wrapped
    return function(cls, **kwargs)
  File "/usr/local/lib/python3.4/dist-packages/praw/handlers.py", line 101, in request
    settings = self.http.merge_environment_settings(
AttributeError: 'Session' object has no attribute 'merge_environment_settings'

This bug was initially discovered here michael-lazar/rtv#325. I've tested on requests v2.4.0 and verified that it solved the problem. I can fix it on my end by changing the package requirements, but if you're still supporting bug fixes for PRAW 3 I think it's worth updating here too.

System Information

PRAW Version: 3.6.1
Python Version: 3.4.0
Operating System: Ubuntu 14.04

[bboe]

Thanks for reporting and great work finding the bug. If you want to make a PR to the PRAW3 branch I will merge it in, however, I am not likely to make a new PRAW3 release unless a large number of issues accumulate. I'm going to close the issue since it's not a problem with the current version.