Drop Python 2 support

.coveragerc

@@ -3,6 +3,5 @@ source = du2webtreemap
 
 [report]
 exclude_lines =
-    pragma: PY2
     pragma: nocover
     if __name__ == .__main__.:

du2webtreemap.py

@@ -16,7 +16,7 @@
 
 
 __author__ = 'Marius Gedminas <marius@gedmin.as>'
-__version__ = '2.0.1'
+__version__ = '2.1.0'
 
 
 def fmt_size(kb):
@@ -83,8 +83,6 @@ def parse_du(input):
             size = int(size)
         except ValueError:
             raise InputSyntaxError('size is not a number: %r' % size)
-        if isinstance(filename, bytes):  # pragma: PY2
-            filename = filename.decode('UTF-8', 'replace')
         filename = filename.rstrip('\r\n/')
         # Process
         node = root

tests.py

@@ -1,10 +1,6 @@
-# -*- coding: utf-8 -*-
 import json
 import sys
-try:
-    from cStringIO import StringIO
-except ImportError:  # pragma: PY3
-    from io import StringIO
+from io import StringIO
 
 import pytest
 

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py37,py38,py39,py310,py311,pypy,pypy3
+envlist = py37,py38,py39,py310,py311,pypy3
 
 [testenv]
 skip_install = true
@@ -13,10 +13,3 @@ deps =
 commands =
     coverage run -m pytest {posargs}
     coverage report -m --fail-under=100
-
-[testenv:coverage2]
-basepython = python2
-deps =
-    {[testenv:coverage]deps}
-commands =
-    {[testenv:coverage]commands}