Update config.py

Author: theahura

openevolve/config.py

@@ -248,6 +248,7 @@ class DatabaseConfig:
     population_size: int = 1000
     archive_size: int = 100
     num_islands: int = 5
+    programs_per_island: Optional[int] = None
 
     # Selection parameters
     elite_selection_ratio: float = 0.1