feat: Remove support for Python 3.7 (#49)

This change removes support for Python 3.7 and removes the upper
restriction on newer Python versions.

Fixes #44
Fixes #47

.github/workflows/checks.yml

@@ -38,7 +38,7 @@ jobs:
     strategy:
       matrix:
         platform: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
 
     steps:
     - name: Checkout repository

setup.cfg

@@ -15,7 +15,6 @@ classifiers =
 	Topic :: Text Processing :: Markup :: XML
 	License :: OSI Approved :: BSD License
 	Programming Language :: Python :: 3
-	Programming Language :: Python :: 3.7
 	Programming Language :: Python :: 3.8
 	Programming Language :: Python :: 3.9
 	Programming Language :: Python :: 3.10
@@ -24,7 +23,7 @@ classifiers =
 
 [options]
 packages = svgcheck, svgcheck.Results, svgcheck.Tests, svgcheck.Tests.cache_saved
-python_requires = >=3.7, <3.13
+python_requires = >=3.8
 install_requires = 
 	lxml>=4.1.1
 	xml2rfc>=3.16.0

tox.ini

@@ -4,11 +4,10 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py{37,38,39,310,311,312}-{linux,macos,windows}
+envlist = py{38,39,310,311,312}-{linux,macos,windows}
 
 [gh-actions]
 python =
-	3.7: py37
 	3.8: py38
 	3.9: py39
 	3.10: py310