Testing: remove 3.6 add 3.12

Author: krassowski

.github/workflows/tests.yml

@@ -11,10 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.7, 3.8, 3.9, '3.10', '3.11']
-        include:
-          - os: ubuntu-20.04
-            python-version: 3.6
+        python-version: [3.7, 3.8, 3.9, '3.10', '3.11', '3.12']
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2

README.md

@@ -6,7 +6,7 @@
 
 On the fly conversion of Python docstrings to markdown
 
-- Python 3.6+
+- Python 3.6+ (tested on 3.7 up to 3.12)
 - can recognise reStructuredText and convert multiple of its features to Markdown
 - since v0.13 includes initial support for Google-formatted docstrings