Update Python versions supported (#84)

Author: arcivanov

index.html

@@ -16,14 +16,17 @@ <h1>
             from other famous build tools like <em>Apache Maven</em> and <em>Gradle</em>.
         </p>
         <p>
-            <em>PyBuilder</em> runs on Python <strong>3.6 to 3.11 and PyPy</strong>.
+            <em>PyBuilder</em> runs on Python <strong>3.7 to 3.12 and PyPy</strong>.
             Every commit is tested via
             <a href="https://github.com/pybuilder/pybuilder/actions/workflows/pybuilder.yml">GitHub Actions</a>
-            on CPython 3.6, 3.7, 3.8, 3.9, 3.10, 3.11 and PyPy on Linux, MacOS
+            on CPython 3.7, 3.8, 3.9, 3.10, 3.11, 3.12 and PyPy on Linux, MacOS
             (with and without Homebrew) and Windows.
         </p>
         <p>
-            <small>v0.12.x still supports Python 2.7, and 3.5 but is no longer maintained, except for critical fixes.</small>
+            <small>v0.13.6 is the last version supporting Python 3.6.</small>
+        </p>
+        <p>
+            <small>v0.12.x still supports Python 2.7, and 3.5 but is no longer maintained.</small>
         </p>
         <p>
             <small>v0.11.x still supports Python 2.6, 3.3 and 3.4 but is no longer maintained.</small>