Bump minimum Python required version to 3.6

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ['3.5', '3.10']
+        python-version: ['3.6', '3.10']
     steps:
       - name: Checkout
         uses: actions/checkout@v3

noxfile.py

@@ -5,7 +5,7 @@
 from pathlib import Path
 
 py_default = "3.10"
-py_envs = (py_default, "3.5")
+py_envs = (py_default, "3.6")
 
 nox.options.error_on_external_run = True
 nox.options.sessions = (
@@ -16,7 +16,7 @@
 @nox.session(python=py_default)
 def clean(session):
     session.notify("test")
-    session.install("coverage[toml]")
+    session.install("coverage[toml]<6.3")
     session.run("coverage", "erase")
 
 
@@ -49,14 +49,14 @@ def lint(session):
 def test(session):
     """Run unit tests, produce coverage data."""
     session.notify("report")
-    session.install("coverage[toml]", "pytest", "xdoctest", "pygments", ".")
+    session.install("coverage[toml]<6.3", "pytest", "xdoctest", "pygments", ".")
     session.run("coverage", "run", "-m", "pytest", "--xdoctest", "-vv",
                 *session.posargs)
 
 
 @nox.session(python=py_default)
 def report(session):
-    session.install("coverage[toml]")
+    session.install("coverage[toml]<6.3")
     session.run("coverage", "combine", "--append")
     session.run("coverage", "report")
 

setup.cfg

@@ -14,11 +14,11 @@ classifiers=
 	Natural Language :: English
 	Operating System :: OS Independent
 	Programming Language :: Python :: 3
-	Programming Language :: Python :: 3.5
+	Programming Language :: Python :: 3.6
 	Programming Language :: Python :: 3 :: Only
 
 [options]
-python_requires = >=3.5
+python_requires = >=3.6
 packages = find:
 package_dir =
 	=src