Drop support for unmaintained python2

Closes #71

setup.cfg

@@ -1,5 +1,5 @@
 [bdist_wheel]
-universal = 1
+python-tag = py3
 
 [doc8]
 max-line-length = 99

setup.py

@@ -1,5 +1,3 @@
-from __future__ import with_statement
-
 import re
 from os import path
 
@@ -27,7 +25,7 @@ def get_abs_path(pathname):
     package_dir={'': "src"},
     packages=["flake8_requirements"],
     install_requires=[
-        "flake8 >= 2.0.0",
+        "flake8 >= 4.0.0",
         "setuptools >= 10.0.0",
         "tomli>=1.2.1; python_version < '3.11'",
     ],
@@ -43,8 +41,8 @@ def get_abs_path(pathname):
         "Intended Audience :: Developers",
         "License :: OSI Approved :: MIT License",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3 :: Only"
         "Topic :: Software Development :: Libraries :: Python Modules",
         "Topic :: Software Development :: Quality Assurance",
     ],

src/flake8_requirements/checker.py

@@ -8,7 +8,6 @@
 from functools import wraps
 from logging import getLogger
 
-import flake8
 from pkg_resources import parse_requirements
 from pkg_resources import yield_lines
 
@@ -18,11 +17,10 @@
     import tomli as tomllib
 
 from .modules import KNOWN_3RD_PARTIES
-from .modules import STDLIB_PY2
 from .modules import STDLIB_PY3
 
 # NOTE: Changing this number will alter package version as well.
-__version__ = "1.7.8"
+__version__ = "2.0.0"
 __license__ = "MIT"
 
 LOG = getLogger('flake8.plugin.requirements')
@@ -33,10 +31,7 @@
 }
 
 STDLIB = set()
-if sys.version_info[0] == 2:
-    STDLIB.update(STDLIB_PY2)
-if sys.version_info[0] == 3:
-    STDLIB.update(STDLIB_PY3)
+STDLIB.update(STDLIB_PY3)
 
 
 def memoize(f):
@@ -334,48 +329,45 @@ def __init__(self, tree, filename, lines=None):
     @classmethod
     def add_options(cls, manager):
         """Register plug-in specific options."""
-        kw = {}
-        if flake8.__version__ >= '3.0.0':
-            kw['parse_from_config'] = True
         manager.add_option(
             "--known-modules",
             action='store',
             default="",
+            parse_from_config=True,
             help=(
                 "User defined mapping between a project name and a list of"
                 " provided modules. For example: ``--known-modules=project:"
                 "[Project],extra-project:[extras,utilities]``."
-            ),
-            **kw)
+            ))
         manager.add_option(
             "--requirements-file",
             action='store',
+            parse_from_config=True,
             help=(
                 "Specify the name (location) of the requirements text file. "
                 "Unless an absolute path is given, the file will be searched "
                 "relative to the project's root directory. If this option is "
                 "given, requirements from setup.py, setup.cfg or "
                 "pyproject.toml will not be taken into account."
-            ),
-            **kw)
+            ))
         manager.add_option(
             "--requirements-max-depth",
-            type=int if flake8.__version__ >= '3.8.0' else 'int',
+            type=int,
             default=1,
+            parse_from_config=True,
             help=(
                 "Max depth to resolve recursive requirements. Defaults to 1 "
                 "(one level of recursion allowed)."
-            ),
-            **kw)
+            ))
         manager.add_option(
             "--scan-host-site-packages",
             action='store_true',
+            parse_from_config=True,
             help=(
                 "Scan host's site-packages directory for 3rd party projects, "
                 "which provide more than one module or the name of the module"
                 " is different than the project name itself."
-            ),
-            **kw)
+            ))
 
     @classmethod
     def parse_options(cls, options):