Update Python versions and fix shield badge.

.github/workflows/run-tests.yml

@@ -16,7 +16,7 @@ jobs:
   build:
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.8, 3.9, 3.10, 3.11, 3.12]
         os: [ubuntu-latest, windows-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:

README.md

@@ -1,4 +1,4 @@
-![GitHub Workflow Status](https://img.shields.io/github/workflow/status/jodhus/pyebur128/Run%20tests)
+![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/jodhus/pyebur128/run-tests.yml?branch=main)
 [![codecov](https://codecov.io/gh/jodhus/pyebur128/branch/master/graph/badge.svg?token=TLA2NXMEF4)](https://codecov.io/gh/jodhus/pyebur128)
 ![GitHub](https://img.shields.io/github/license/jodhus/pyebur128)
 ![PyPI - Python Version](https://img.shields.io/pypi/pyversions/pyebur128)
@@ -11,7 +11,7 @@ A Cython implementation of the [libebur128](https://github.com/jiixyj/libebur128
 ## Requirements
 
 * Operating Systems: Linux, macOS, or Windows
-* Python: 3.6+
+* Python: 3.8+
 * Dependencies: None!
 
 ## Installation