Drop Python 3.6

see: zarr-developers#317
see: zarr-developers/zarr-python#765

Author: joshmoore

.github/workflows/ci-linux.yaml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
         os: [ubuntu-18.04, ubuntu-20.04]
 
     steps:

.github/workflows/ci-osx.yaml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
 
     steps:
       - name: Checkout source

.github/workflows/ci-windows.yaml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
 
     steps:
       - name: Checkout source

docs/contributing.rst

@@ -43,8 +43,8 @@ a bug report:
    interpreter can be obtained by running a Python interactive session, e.g.::
 
     $ python
-    Python 3.6.1 (default, Mar 22 2017, 06:17:05)
-    [GCC 6.3.0 20170321] on linux
+    Python 3.7.6 (default, Jan  8 2020, 13:42:34)
+    [Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
 
 3. An explanation of why the current behaviour is wrong/not desired, and what you
    expect instead.

setup.py

@@ -346,7 +346,7 @@ def run_setup(with_extensions):
         ext_modules=ext_modules,
         cmdclass=cmdclass,
         package_dir={"": "."},
-        python_requires=">=3.6, <4",
+        python_requires=">=3.7, <4",
         packages=["numcodecs", "numcodecs.tests"],
         classifiers=[
             "Development Status :: 4 - Beta",
@@ -358,10 +358,10 @@ def run_setup(with_extensions):
             "Topic :: Software Development :: Libraries :: Python Modules",
             "Operating System :: Unix",
             "Programming Language :: Python :: 3",
-            "Programming Language :: Python :: 3.6",
             "Programming Language :: Python :: 3.7",
             "Programming Language :: Python :: 3.8",
             "Programming Language :: Python :: 3.9",
+            "Programming Language :: Python :: 3.10",
         ],
         author='Alistair Miles',
         author_email='alimanfoo@googlemail.com',