Remove Python 2 support

AUTHORS.rst

@@ -26,3 +26,4 @@ Contributors
 * Vadim Pushtaev (@VadimPushtaev)
 * Martin Larralde (@althonos)
 * Qudus Oladipo (@stikks)
+* Sean Aubin (@seanny123)

README.rst

@@ -23,14 +23,13 @@ replacement with fully compatible API (import ``property_cached`` instead of
 ``cached_property`` in your code and *voilà*). In case development resumes on
 the original library, this one is likely to be deprecated.
 
-*Original readme included below:*
+*Slightly modified README included below:*
 
 Why?
 -----
 
 * Makes caching of time or computational expensive properties quick and easy.
 * Because I got tired of copy/pasting this code from non-web project to non-web project.
-* I needed something really simple that worked in Python 2 and 3.
 
 How to use it
 --------------

property_cached/__init__.py

@@ -1,17 +1,10 @@
-# -*- coding: utf-8 -*-
-
+import asyncio
 import functools
 import pkg_resources
-import sys
 import threading
 import weakref
 from time import time
 
-try:
-    import asyncio
-except (ImportError, SyntaxError):
-    asyncio = None
-
 
 __author__ = "Martin Larralde"
 __email__ = "[email protected]"
@@ -27,17 +20,7 @@ class cached_property(property):
     """  # noqa
 
     _sentinel = object()
-
-    if sys.version_info[0] < 3:
-
-        def _update_wrapper(self, func):
-            self.__doc__ = getattr(func, "__doc__", None)
-            self.__module__ = getattr(func, "__module__", None)
-            self.__name__ = getattr(func, "__name__", None)
-
-    else:
-
-        _update_wrapper = functools.update_wrapper
+    _update_wrapper = functools.update_wrapper
 
     def __init__(self, func):
         self.cache = weakref.WeakKeyDictionary()