Update config.yml

config.yml

@@ -164,7 +164,7 @@ challenge:                         # Incoming challenges.
     - blitz
     - rapid
     - classical
-#   - correspondence
+    - correspondence
   modes:                           # Game modes to accept.
     - casual                       # Unrated games.
     - rated                        # Rated games - must comment if the engine doesn't try to win.