Add deprecation notice to all documents and setup.py

README.rst

@@ -11,6 +11,8 @@
 About
 =====
 
+.. warning:: This project will be ending it's support of Python 3.5 and lower with release 6.0.0.
+
 This library provides encoding and decoding for the Concise Binary Object Representation (CBOR)
 (`RFC 7049`_) serialization format. `Read the docs <https://cbor2.readthedocs.io/>`_ to learn more.
 
@@ -48,7 +50,7 @@ Installation
 Requirements
 ------------
 
-* cPython==2.7 or cPython>=3.5 or `PyPy`_ (Python 2.7 support will be removed soon)
+* cPython==2.7 or cPython>=3.5 or `PyPy`_ (Python 2.7 and 3.5 support will be removed with release 6.0.0)
 * C-extension: Any C compiler that can build Python extensions.
   Any modern libc with the exception of Glibc<2.9
 

docs/versionhistory.rst

@@ -5,6 +5,13 @@ Version history
 
 This library adheres to `Semantic Versioning <http://semver.org/>`_.
 
+**5.2.0-rc1** (Unreleased)
+
+- README: Announce deprecation of Python 2.7, 3.5
+- README: More detail and examples
+- Bugfix: Fix segfault on loading huge arrays with C-backend (Sekenre)
+- Build system: Allow packagers to force C-backend building or disable using env var (jameshilliard)
+- Feature: :module:`cbor2.tool` Command line diagnostic tool
 
 **5.1.2** (2020-07-21)
 

setup.py

@@ -1,11 +1,15 @@
 import sys
 import os
 import platform
+import warnings
 from pkg_resources import parse_version
 from setuptools import setup, Extension
 
 min_glibc = parse_version('2.9')
 
+if sys.version_info < (3, 6):
+    warnings.warn("Support for Python<3.6 will be dropped with cbor2 version 6.0.0")
+
 
 def check_libc():
     "check that if we have glibc < 2.9 we should not build c ext"