Stop testing cloudpickle against Python 3.5 (#427)

Co-authored-by: Olivier Grisel <[email protected]>

Author: pierreglaser

Diff for: .github/workflows/testing.yml

@@ -29,7 +29,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python_version: [3.5, 3.6, 3.7, 3.8, 3.9, "3.10-dev", "pypy3"]
+        python_version: [3.6, 3.7, 3.8, 3.9, "3.10-dev", "pypy3"]
         exclude:
           # Do not test all minor versions on all platforms, especially if they
           # are not the oldest/newest supported versions

Diff for: CHANGES.md

@@ -4,6 +4,8 @@
 dev
 ===
 
+- Python 3.5 is no longer supported.
+
 - Fix a side effect altering dynamic modules at pickling time.
   ([PR #426](https://github.com/cloudpipe/cloudpickle/pull/426))
 

Diff for: setup.py

@@ -39,7 +39,6 @@ def find_version():
         'Operating System :: POSIX',
         'Operating System :: Microsoft :: Windows',
         'Operating System :: MacOS :: MacOS X',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
@@ -51,5 +50,5 @@ def find_version():
         'Topic :: System :: Distributed Computing',
     ],
     test_suite='tests',
-    python_requires='>=3.5',
+    python_requires='>=3.6',
 )