Drop support for EOL Python 3.5 and 3.6

.github/workflows/pythonpackage.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.5", "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

setup.py

@@ -22,7 +22,7 @@
     zip_safe=False,
     install_requires=['smmap>=3.0.1,<6'],
     long_description="""GitDB is a pure-Python git object database""",
-    python_requires='>=3.6',
+    python_requires='>=3.7',
     # See https://pypi.python.org/pypi?%3Aaction=list_classifiers
     classifiers=[
         "Development Status :: 5 - Production/Stable",
@@ -35,7 +35,6 @@
         "Operating System :: MacOS :: MacOS X",
         "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",