Drop support for Python 3.6

Author: dmtucker

.github/workflows/validation.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-python@v4

setup.py

@@ -29,12 +29,12 @@ def read(fname):
     py_modules=[
         os.path.splitext(os.path.basename(path))[0] for path in glob.glob("src/*.py")
     ],
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     setup_requires=["setuptools-scm>=3.5"],
     install_requires=[
         "attrs>=19.0",
         "filelock>=3.0",
-        'pytest>=4.6; python_version>="3.6" and python_version<"3.10"',
+        'pytest>=4.6; python_version<"3.10"',
         'pytest>=6.2; python_version>="3.10"',
         'mypy>=0.500; python_version<"3.8"',
         'mypy>=0.700; python_version>="3.8" and python_version<"3.9"',
@@ -48,7 +48,6 @@ def read(fname):
         "Topic :: Software Development :: Testing",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",

tox.ini

@@ -3,7 +3,6 @@
 minversion = 3.20
 isolated_build = true
 envlist =
-    py36-pytest{4.6, 5.0, 5.x, 6.0, 6.x, 7.0, 7.x}-mypy{0.50, 0.5x, 0.60, 0.6x, 0.70, 0.7x, 0.80, 0.8x, 0.90, 0.9x}
     py37-pytest{4.6, 5.0, 5.x, 6.0, 6.x, 7.0, 7.x}-mypy{0.50, 0.5x, 0.60, 0.6x, 0.70, 0.7x, 0.80, 0.8x, 0.90, 0.9x}
     py38-pytest{4.6, 5.0, 5.x, 6.0, 6.x, 7.0, 7.x}-mypy{0.71, 0.7x, 0.80, 0.8x, 0.90, 0.9x}
     py39-pytest{4.6, 5.0, 5.x, 6.0, 6.x, 7.0, 7.x}-mypy{0.78, 0.7x, 0.80, 0.8x, 0.90, 0.9x}
@@ -14,7 +13,6 @@ envlist =
 
 [gh-actions]
 python =
-    3.6: py36-pytest{4.6, 5.0, 5.x, 6.0, 6.x, 7.0, 7.x}-mypy{0.50, 0.5x, 0.60, 0.6x, 0.70, 0.7x, 0.80, 0.8x, 0.90, 0.9x}
     3.7: py37-pytest{4.6, 5.0, 5.x, 6.0, 6.x, 7.0, 7.x}-mypy{0.50, 0.5x, 0.60, 0.6x, 0.70, 0.7x, 0.80, 0.8x, 0.90, 0.9x}
     3.8: py38-pytest{4.6, 5.0, 5.x, 6.0, 6.x, 7.0, 7.x}-mypy{0.71, 0.7x, 0.80, 0.8x, 0.90, 0.9x}, publish, static
     3.9: py39-pytest{4.6, 5.0, 5.x, 6.0, 6.x, 7.0, 7.x}-mypy{0.78, 0.7x, 0.80, 0.8x, 0.90, 0.9x}