Update app.py

app.py

@@ -17,7 +17,7 @@ password=os.environ.get("MONGODB")
 
 def init_database():
     uri = f"mongodb+srv://new-user:{password}@cluster0.xb2urf6.mongodb.net/?retryWrites=true&w=majority&appName=Cluster0"
-    client = MongoClient(uri, tls=True, tlsAllowInvalidCertificates=True)
+    client = MongoClient(uri,server_api=ServerApi('1'))
     db = client["elo_ratings"]
     collection = db["elo_ratings"]
     return collection