Drop support for untestable EOL Python 3.5

.github/workflows/python-package.yml

@@ -49,8 +49,6 @@ jobs:
           - '3.13'
           - 'pypy-3.9'
         include:
-          - python-version: 3.5
-            os: ubuntu-20.04
           - python-version: 3.6
             os: ubuntu-20.04
     runs-on: ${{ matrix.os || 'ubuntu-latest' }}

README.rst

@@ -183,7 +183,7 @@ Additional Notes
 * **Packages**. The latest tagged release version is published in the
   `Python Package Index <https://pypi.org/project/idna/>`_.
 
-* **Version support**. This library supports Python 3.5 and higher.
+* **Version support**. This library supports Python 3.6 and higher.
   As this library serves as a low-level toolkit for a variety of
   applications, many of which strive for broad compatibility with older
   Python versions, there is no rush to remove older interpreter support.

pyproject.toml

@@ -19,7 +19,6 @@ classifiers = [
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
   "Programming Language :: Python :: 3 :: Only",
-  "Programming Language :: Python :: 3.5",
   "Programming Language :: Python :: 3.6",
   "Programming Language :: Python :: 3.7",
   "Programming Language :: Python :: 3.8",
@@ -34,7 +33,7 @@ classifiers = [
   "Topic :: Software Development :: Libraries :: Python Modules",
   "Topic :: Utilities",
 ]
-requires-python = ">=3.5"
+requires-python = ">=3.6"
 dynamic = ["version"]
 
 [project.urls]

setup.cfg

@@ -14,7 +14,6 @@ classifiers =
   Programming Language :: Python
   Programming Language :: Python :: 3
   Programming Language :: Python :: 3 :: Only
-  Programming Language :: Python :: 3.5
   Programming Language :: Python :: 3.6
   Programming Language :: Python :: 3.7
   Programming Language :: Python :: 3.8
@@ -30,7 +29,7 @@ classifiers =
   Topic :: Utilities
 
 [options]
-python_requires = >=3.5
+python_requires = >=3.6
 packages=find:
 
 [options.packages.find]