Drop support for old Python versions

Fixes JonnyJD#130

.github/workflows/python-package.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [2.6, 2.7, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, pypy2, pypy3]
+        python-version: [3.7, 3.8, 3.9, 3.10, pypy3]
 
     steps:
     - uses: actions/checkout@v2

README.rst

@@ -26,7 +26,7 @@ Features:
 Dependencies:
 -------------
 
-* Python 2 >= 2.6 or Python 3 >= 3.1
+* Python 3 >= 3.7
 * python-discid_ >= 1.0.0 (or python-libdiscid_ >= 0.2.0)
 * python-musicbrainzngs_ >= 0.4
 * keyring_ (optional)

isrcsubmit.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (C) 2009-2015 Johannes Dewender
 #
 # This program is free software: you can redistribute it and/or modify

setup.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import unittest

test_isrcsubmit.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright (C) 2014  Johannes Dewender
 # This test is free. You can redistribute and/or modify it at will.