unix: Optionally create the opinionated log/ in `user_log_dir()` (#208)

diff --git a/src/platformdirs/unix.py b/src/platformdirs/unix.py
index cddce49..c355f17 100644
--- a/src/platformdirs/unix.py
+++ b/src/platformdirs/unix.py
@@ -119,6 +119,7 @@
         path = self.user_state_dir
         if self.opinion:
             path = os.path.join(path, "log")  # noqa: PTH118
+            self._optionally_create_directory(path)
         return path
 
     @property