chore: remove python 2 specific handling

Refs: #23

Signed-off-by: Mike Fiedler <miketheman@gmail.com>

pytest_socket.py

@@ -1,11 +1,9 @@
 # -*- coding: utf-8 -*-
 import socket
-import sys
 import pytest
 
 _true_socket = socket.socket
 _true_connect = socket.socket.connect
-is_py2 = sys.version_info[0] == 2
 
 
 class SocketBlockedError(RuntimeError):
@@ -108,20 +106,11 @@ def host_from_address(address):
         return host
 
 
-def host_from_address_py2(address):
-    host = address[0]
-    if isinstance(host, str) or isinstance(host, unicode):  # noqa F821
-        return host
-
-
 def host_from_connect_args(args):
     address = args[0]
 
     if isinstance(address, tuple):
-        if is_py2:
-            return host_from_address_py2(address)
-        else:
-            return host_from_address(address)
+        return host_from_address(address)
 
 
 def socket_allow_hosts(allowed=None):