Fix missing newline in generated config output

- Added a newline after appending the formatted string in `ConfigProvider.java`.

common/src/main/java/cc/toph/simplycompat/config/ConfigProvider.java

@@ -24,6 +24,7 @@ public class ConfigProvider implements SimpleConfig.DefaultConfig {
         contents += String.format("""
                 # %s
                 %s = %s
+                
                 """, comment, key, value);
     }