Maybe copy the defaults on load to get the new config options?

Still not too sure if this will work correctly, as I don't know if this
will override the changes in the config.

src/main/java/com/graywolf336/jail/JailMain.java

@@ -51,6 +51,9 @@ public class JailMain extends JavaPlugin {
 		//Only create the default config if it doesn't exist
 		saveDefaultConfig();
 		
+		//Append new key-value pairs to the config
+		getConfig().options().copyDefaults(true);
+		
 		// Set the header and save
         getConfig().options().header(getHeader());
         saveConfig();