Merge branch 'develop' into 1.1.x

# Conflicts:
#	pyproject.toml
#	src/sklearndf/_version.py

test/test/sklearndf/test_package_version.py

@@ -40,3 +40,22 @@ def test_package_version() -> None:
     assert (
         dev_version not in releases
     ), f"Current package version {dev_version} already on PyPi"
+
+    is_minor_or_major_release = dev_version.endswith(".0")
+
+    if is_minor_or_major_release:
+        pre_releases = [
+            version
+            for version in releases
+            if re.match(f"{dev_version}rc\\d+$", version)
+        ]
+
+        assert pre_releases, (
+            f"Release of major or minor version {dev_version} "
+            f"requires at least one pre-release, e.g. {dev_version}rc0"
+        )
+
+        log.info(
+            f"Pre-release(s) {pre_releases} exist(s) – "
+            f"release of major/minor version {dev_version} allowed"
+        )