fails to work with newer requests releases #76
Description
as partially described in #74, linkchecker seems to fail when using requests releases newer than 2.15. here's a backtrace:
File "/usr/lib/python2.7/site-packages/linkcheck/checker/httpurl.py", line 197, in _get_ssl_sock
line: if raw_connection.sock is None:
locals:
raw_connection = <local> None
raw_connection.sock = <local> !AttributeError: 'NoneType' object has no attribute 'sock'
None = <builtin> None
AttributeError: 'NoneType' object has no attribute 'sock'