Added Python 3.11 to test matrix (#46)

.github/workflows/django4.yml

@@ -11,11 +11,11 @@ on:
 
 jobs:
 
-  django3:
+  django4:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10']
+        python-version: ['3.8', '3.9', '3.10', '3.11']
 
     steps:
     - uses: actions/checkout@v3

README.md

@@ -1,7 +1,7 @@
 # DjangoAdminGeomap library
 [![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/vb64/django.admin.geomap/pep257.yml?label=Pep257&style=plastic&branch=main)](https://github.com/vb64/django.admin.geomap/actions?query=workflow%3Ageomap-pep257)
 [![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/vb64/django.admin.geomap/django3.yml?label=Django%203.2.14%20Python%203.7-3.10&style=plastic&branch=main)](https://github.com/vb64/django.admin.geomap/actions?query=workflow%3Adjango3)
-[![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/vb64/django.admin.geomap/django4.yml?label=Django%204.1.1%20Python%203.8-3.10&style=plastic&branch=main)](https://github.com/vb64/django.admin.geomap/actions?query=workflow%3Adjango4)
+[![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/vb64/django.admin.geomap/django4.yml?label=Django%204.1.1%20Python%203.8-3.11&style=plastic&branch=main)](https://github.com/vb64/django.admin.geomap/actions?query=workflow%3Adjango4)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/d565c3a3d78e4e198f35688432a741eb)](https://www.codacy.com/gh/vb64/django.admin.geomap/dashboard?utm_source=github.com&utm_medium=referral&utm_content=vb64/django.admin.geomap&utm_campaign=Badge_Grade)
 [![Codacy Badge](https://app.codacy.com/project/badge/Coverage/d565c3a3d78e4e198f35688432a741eb)](https://www.codacy.com/gh/vb64/django.admin.geomap/dashboard?utm_source=github.com&utm_medium=referral&utm_content=vb64/django.admin.geomap&utm_campaign=Badge_Coverage)