go ahead and drop Python 3.6 outright as it is already starting to

cause some maintenance headaches

.github/workflows/ci.yml

@@ -13,17 +13,13 @@ jobs:
       fail-fast: false
       matrix:
         platform: ["ubuntu-latest", "macos-latest"]
-        python-version: ["3.6", "3.7", "3.8"]
+        python-version: ["3.7", "3.8"]
         gap-version: ["4.10.2", "4.11.0"]
         exclude:
-          - python-version: "3.6"
-            gap-version: "4.11.0"
           - python-version: "3.7"
             gap-version: "4.11.0"
           - python-version: "3.8"
             gap-version: "4.10.2"
-          - platform: "macos-latest"
-            python-version: "3.6"
           - platform: "macos-latest"
             python-version: "3.7"
     runs-on: "${{ matrix.platform }}"

.gitignore

@@ -16,7 +16,7 @@ gappy/*.dll
 dist/
 
 ## Local development virtual env
-.venv
+.venv*
 
 ## setuptools_scm files
 gappy/_version.py

CHANGES.rst

@@ -4,6 +4,12 @@ Changelog
 v0.1.0a4 (unreleased)
 ---------------------
 
+Breaking changes
+^^^^^^^^^^^^^^^^
+
+* Dropped support for Python 3.6; Python 3.7+ is officially supported (3.6 may
+  still work but is not tested).
+
 Enhancements
 ^^^^^^^^^^^^
 

setup.cfg

@@ -16,15 +16,14 @@ classifiers =
     License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)
     Operating System :: POSIX :: Linux
     Programming Language :: Cython
-    Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Topic :: Scientific/Engineering :: Mathematics
 
 [options]
 # We set packages to find: to automatically find all sub-packages
 packages = find:
-python_requires = >=3.6
+python_requires = >=3.7
 setup_requires = setuptools_scm
 install_requires =
     cysignals