Document Python 3.7 requirement

Author: bcail

README.rst

@@ -32,7 +32,7 @@ The documentation is hosted at https://docs.gunicorn.org.
 Installation
 ------------
 
-Gunicorn requires **Python 3.x >= 3.5**.
+Gunicorn requires **Python 3.x >= 3.7**.
 
 Install from PyPI::
 

docs/source/index.rst

@@ -23,7 +23,7 @@ Features
 * Simple Python configuration
 * Multiple worker configurations
 * Various server hooks for extensibility
-* Compatible with Python 3.x >= 3.5
+* Compatible with Python 3.x >= 3.7
 
 
 Contents

docs/source/install.rst

@@ -4,7 +4,7 @@ Installation
 
 .. highlight:: bash
 
-:Requirements: **Python 3.x >= 3.5**
+:Requirements: **Python 3.x >= 3.7**
 
 To install the latest released version of Gunicorn::
 

setup.py

@@ -21,8 +21,6 @@
     'Operating System :: POSIX',
     'Programming Language :: Python',
     'Programming Language :: Python :: 3',
-    'Programming Language :: Python :: 3.5',
-    'Programming Language :: Python :: 3.6',
     'Programming Language :: Python :: 3.7',
     'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3.9',
@@ -100,7 +98,7 @@ def run_tests(self):
         'Source code': 'https://github.com/benoitc/gunicorn',
     },
 
-    python_requires='>=3.5',
+    python_requires='>=3.7',
     install_requires=install_requires,
     classifiers=CLASSIFIERS,
     zip_safe=False,