Update setup.py with version bump

Author: lmcinnes

setup.py

@@ -55,7 +55,7 @@ def requirements():
 
 configuration = {
     'name': 'hdbscan',
-    'version': '0.8.39',
+    'version': '0.8.40',
     'description': 'Clustering based on density with variable density clusters',
     'long_description': readme(),
     'classifiers': [