Add support for different python version

Author: bigbag

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4

README.md

@@ -1,7 +1,7 @@
 # EPUB Optimizer for Xteink X4
 
 [![Tests](https://github.com/bigbag/epub-optimizer-xteink/workflows/Tests/badge.svg)](https://github.com/bigbag/epub-optimizer-xteink/actions?query=workflow%3ATests)
-[![versions](https://img.shields.io/badge/python-3.12-blue.svg)](https://github.com/bigbag/epub-optimizer-xteink)
+[![versions](https://img.shields.io/badge/python-3.10%20|%203.11%20|%203.12%20|%203.13-blue.svg)](https://github.com/bigbag/epub-optimizer-xteink)
 [![license](https://img.shields.io/github/license/bigbag/epub-optimizer-xteink.svg)](https://github.com/bigbag/epub-optimizer-xteink/blob/main/LICENSE)
 
 Optimizes EPUB files for the Xteink X4 e-reader (and similar small e-paper devices).

pyproject.toml

@@ -3,7 +3,7 @@ name = "epub-optimizer-xteink"
 version = "0.1.0"
 description = "EPUB optimizer for Xteink X4 e-reader (480x800 e-paper display)"
 readme = "README.md"
-requires-python = ">=3.12"
+requires-python = ">=3.10"
 license = "MIT"
 keywords = ["epub", "ebook", "e-reader", "xteink", "e-ink", "e-paper"]
 dependencies = [