Update stone version to 3.3.9 (#353)

Author: rhui-dbx

setup.py

@@ -36,7 +36,7 @@
 
 dist = setup(
     name='stone',
-    version='3.3.8',
+    version='3.3.9',
     install_requires=install_reqs,
     setup_requires=setup_requires,
     tests_require=test_reqs,