Support more recent Python versions

Focus testing on Python 3.8+

.github/workflows/package.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.7"]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
 
     steps:
     - uses: actions/checkout@v3

.readthedocs.yaml

@@ -4,7 +4,7 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.7"
+    python: "3.11"
 
 sphinx:
   configuration: docs/conf.py

setup.py

@@ -21,7 +21,10 @@
         'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
         'Programming Language :: Python :: 3 :: Only',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
     ],
     entry_points="""
         [console_scripts]

tests/sample_output.txt

@@ -315,7 +315,7 @@ Test:
  Test without decorator.
 
 
-DecoratorsTestCase::test_one_decorator:264
+DecoratorsTestCase::test_one_decorator:265
 ------------------------------------------
 
 Assert:
@@ -334,7 +334,7 @@ Test:
  Test with one decorator.
 
 
-DecoratorsTestCase::test_multiple_decorators:269
+DecoratorsTestCase::test_multiple_decorators:271
 ------------------------------------------------
 
 Assert:
@@ -372,7 +372,7 @@ Test:
  Test without decorator.
 
 
-MergeDecoratorsTestCase::test_decorator:289
+MergeDecoratorsTestCase::test_decorator:290
 -------------------------------------------
 
 Assert: