Allow members with ban permissions to ban others

bot.js

@@ -449,8 +449,8 @@ async function addRole(message) {
 }
 
 async function ban(message) {
-  if (!message.member.hasPermission('ADMINISTRATOR')) {
-    message.reply('you do not have admin privileges!')
+  if (!message.member.hasPermission('BAN_MEMBERS')) {
+    message.reply('you do not have ban permissions!')
     return;
   }
 
@@ -484,6 +484,10 @@ async function ban(message) {
     return;
   }
 
+  if (member.roles.highest.comparePositionTo(message.member.roles.highest) > 0) {
+    message.reply("this member is above you!")
+  }
+
     let verificationEmbed = new Discord.MessageEmbed()
       .setTitle(`Are you sure you would like to ban \`${member.user.tag}\`?`)
       .setAuthor(member.user.tag, member.user.avatarURL())