Update nylon.py

nylon.py

@@ -93,7 +93,7 @@ class ChatDatabase:
         self.tfidf = None
 
     def load_messages(self):
-        with open(self.filename, 'a') as file:
+        with open(self.filename, 'w') as file:
             pass
         with open(self.filename, 'r') as f:
             for line in f: