Drop support for end-of-life Python 2.7 and 3.5

Author: hartwork

.github/workflows/black.yml

@@ -9,3 +9,5 @@ jobs:
       - uses: actions/[email protected]
       - uses: actions/[email protected]
       - uses: psf/[email protected]
+        env:
+          INPUT_BLACK_ARGS: --target-version py36

.github/workflows/run-tests.yml

@@ -12,7 +12,7 @@ jobs:
     name: Run the test suite
     strategy:
       matrix:
-        python-version: [2.7, 3.5, 3.9]  # no explicit need for 3.6, 3.7, 3.8
+        python-version: [3.6, 3.9]  # no explicit need for 3.7, 3.8
         runs-on: [macos-latest, ubuntu-latest]
     runs-on: ${{ matrix.runs-on }}
     steps:

.pre-commit-config.yaml

@@ -3,4 +3,5 @@ repos:
     rev: 20.8b1
     hooks:
       - id: black
-        language_version: python3 
+        language_version: python3
+        args: ['--target-version', 'py36']

setup.py

@@ -24,19 +24,18 @@
         "Intended Audience :: Science/Research",
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
+        "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 2.7",
-        "Programming Language :: Python :: 2",
         "Topic :: Multimedia :: Graphics :: Editors :: Vector-Based",
         "Topic :: Scientific/Engineering :: Visualization",
         "Topic :: Text Processing :: Markup",
     ],
     package_dir={"": "src"},
+    python_requires=">=3.6",
     install_requires=["lxml"],
     download_url="https://github.com/btel/svg_utils/archive/v{}.tar.gz".format(
         version_str