Subject: Travis CI: Test on Python 3.13 beta
Origin: upstream, commit 0.4.27-23-g8eecfb7 <https://github.com/ahupp/python-magic/commit/0.4.27-23-g8eecfb7>
Author: Christian Clauss <cclauss@me.com>
Date: Sat May 11 08:19:57 2024 +0200

    The Python 3.13 release notes mention `python-magic` as one of the alternatives for `imghdr` which was removed from the Standard Library so let's ensure that its tests pass on Python 3.13 beta.

    https://www.python.org/downloads/release/python-3130b1/

    May raise `ModuleNotFoundError: No module named 'imghdr'` because Python 3.13 removes it from the Standard Library.
    * https://docs.python.org/3/library/imghdr.html

    > imghdr: use the projects [filetype](https://pypi.org/project/filetype/), [puremagic](https://pypi.org/project/puremagic/), or [python-magic](https://pypi.org/project/python-magic/) instead. (Contributed by Victor Stinner in [gh-104773](https://github.com/python/cpython/issues/104773).)

    https://docs.python.org/3.13/whatsnew/3.13.html#pep-594-dead-batteries-and-other-module-removals

--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,7 @@
   - "3.10"
   - "3.11"
   - "3.12"
+  - "3.13"
 
 install:
   - pip install coverage coveralls codecov