Remove use of the future package

It was providing Python 2 compatibility.

linkcheck/checker/ftpurl.py

@@ -25,8 +25,6 @@ except ImportError:
     # Python 3
     from io import StringIO
 
-from builtins import bytes
-
 from .. import log, LOG_CHECK, LinkCheckerError, mimeutil
 from . import proxysupport, httpurl, internpaturl, get_index_html
 from .const import WARN_FTP_MISSING_SLASH

linkcheck/checker/urlbase.py

@@ -40,7 +40,6 @@ import socket
 import select
 from io import BytesIO
 from builtins import str as str_text
-from future.utils import python_2_unicode_compatible
 
 from . import absolute_url, get_url_from
 from .. import (log, LOG_CHECK,
@@ -82,7 +81,6 @@ def url_norm (url, encoding):
         raise LinkCheckerError(msg)
 
 
-@python_2_unicode_compatible
 class UrlBase (object):
     """An URL with additional information like validity etc."""
 

linkcheck/configuration/confparse.py

@@ -22,7 +22,6 @@ except ImportError: # Python 2
     from ConfigParser import RawConfigParser
 import os
 from .. import LinkCheckerError, get_link_pat, LOG_CHECK, log, fileutil, plugins, logconf
-from builtins import str
 
 
 def read_multiline (value):

requirements.txt

@@ -3,6 +3,5 @@ beautifulsoup4
 requests >= 2.4
 pyxdg
 dnspython
-future
 # optional:
 argcomplete

setup.py

@@ -409,7 +409,6 @@ setup(
         'dnspython',
         'beautifulsoup4',
         'pyxdg',
-        'future',
     ],
     # Commented out since they are untested and not officially supported.
     # See also doc/install.txt for more detailed dependency documentation.

tests/test_containers.py

@@ -22,8 +22,6 @@ import unittest
 
 import linkcheck.containers
 
-from builtins import range
-
 
 class TestLFUCache (unittest.TestCase):
     """Test LFU cache implementation."""

tests/test_dummy.py

@@ -20,8 +20,6 @@ Test dummy object.
 
 import unittest
 
-from builtins import str
-
 import linkcheck.dummy
 
 

tests/test_updater.py

@@ -19,9 +19,9 @@ Test update check functionality.
 """
 
 import unittest
+
 from tests import need_network
 import linkcheck.updater
-from builtins import str
 
 
 class TestUpdater (unittest.TestCase):

tox.ini

@@ -30,5 +30,4 @@ deps =
     requests >= 2.4
     pyxdg
     dnspython
-    future
     {[base]deps}