Update main.js.example

fix a boardDefault breaking manage pages #128

configs/main.js.example

@@ -269,6 +269,7 @@ module.exports = {
 		maxReplyMessageLength: 4000,
 		defaultName: 'Anon',
 		customCSS: null,
+		blockedCountries: [], //2 char ISO country codes to block
 		filters: [], //words/phrases to block
 		filterMode: 0, //0=nothing, 1=prevent post, 2=auto ban
 		filterBanDuration: 0, //duration (in ms) to ban if filter mode=2