Bump forward-facing Python version to 3.9

Author: evantypanski

README

@@ -75,7 +75,7 @@ Local Previewing (How To Build)
 
 First make sure you have the required dependencies used for building docs:
 
-* Python interpreter >= 3.7
+* Python interpreter >= 3.9
 * Sphinx: https://www.sphinx-doc.org/en/master/
 * Read the Docs Sphinx Theme: https://github.com/rtfd/sphinx_rtd_theme
 * GitPython: https://github.com/gitpython-developers/GitPython

install.rst

@@ -175,7 +175,7 @@ development headers for libraries:
     * Libpcap (http://www.tcpdump.org)
     * Make
     * OpenSSL (http://www.openssl.org)
-    * Python 3.7 or greater (https://www.python.org/)
+    * Python 3.9 or greater (https://www.python.org/)
     * SWIG (http://www.swig.org)
     * Zlib (https://zlib.net/)