Stop advertising python 2 support

.travis.yml

@@ -2,8 +2,6 @@ language: python
 matrix:
   include:
-    - python: 2.7
-      env: TOXENV=py27
     - python: 3.4
       env: TOXENV=py34
     - python: 3.5

astroid/__pkginfo__.py

@@ -7,11 +7,6 @@
 """astroid packaging information"""
-from sys import version_info as py_version
-
-from pkg_resources import parse_version
-from setuptools import __version__ as setuptools_version
-
 distname = 'astroid'
 modname = 'astroid'
@@ -22,28 +17,6 @@ numversion = tuple(map(int, version.split('.')))
 extras_require = {}
 install_requires = ['lazy_object_proxy', 'six', 'wrapt']
-
-def has_environment_marker_range_operators_support():
-    """Code extracted from 'pytest/setup.py'
-    https://github.com/pytest-dev/pytest/blob/7538680c/setup.py#L31
-
-    The first known release to support environment marker with range operators
-    it is 17.1, see: https://setuptools.readthedocs.io/en/latest/history.html#id113
-    """
-    return parse_version(setuptools_version) >= parse_version('17.1')
-
-
-if has_environment_marker_range_operators_support():
-    extras_require[':python_version<"3.4"'] = ['enum34>=1.1.3',
-                                               'singledispatch',
-                                               'backports.functools_lru_cache']
-else:
-    if py_version < (3, 4):
-        install_requires.extend(['enum34',
-                                 'singledispatch',
-                                 'backports.functools_lru_cache'])
-
-
 # pylint: disable=redefined-builtin; why license is a builtin anyway?
 license = 'LGPL'
@@ -57,8 +30,6 @@ description = "A abstract syntax tree for Python with inference support."
 classifiers = ["Topic :: Software Development :: Libraries :: Python Modules",
                "Topic :: Software Development :: Quality Assurance",
                "Programming Language :: Python",
-               "Programming Language :: Python :: 2",
-               "Programming Language :: Python :: 2.7",
                "Programming Language :: Python :: 3",
                "Programming Language :: Python :: 3.4",
                "Programming Language :: Python :: 3.5",

setup.py

@@ -52,7 +52,7 @@ def install():
                  author_email = author_email,
                  url = web,
                  include_package_data = True,
-                 python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
+                 python_requires='>=3.4.*',
                  install_requires = install_requires,
                  extras_require=extras_require,
                  packages = find_packages(),

tox.ini

 [tox]
-envlist = py27, py34, py35, py36, py37, pypy, pylint
+envlist = py34, py35, py36, py37, pypy, pylint
 skip_missing_interpreters = true
 [testenv:pylint]