Use has instead of get

This function has been renamed and stuff so I have to rethink how I'll
implement tests for it.

tests/getGuildCount.test.js

@@ -1,17 +0,0 @@
-const getGuildInfo = require('../util/getGuildInfo');
-
-
-
-test("Testing getGuildCount", () => {
-    for(let i = 1; i < 200000; i = i+i*30 ){
-        let client = {guilds: {cache: new Map()}}
-        client.guilds.cache.each = client.guilds.cache.forEach;
-
-        for(let j = 0; j < i; j++){
-            client.guilds.cache.set(`num: ${j}`, j);
-        }
-        
-        expect(getGuildInfo(client).guildCount).toBe(i);
-        
-    }
-})

util/getGuildInfo.js

@@ -1,16 +1,16 @@
 module.exports = function(client){
 	let guildCount = 0;
 	let totalMembers = 0;
-	let uniqueMembers = new Map();
+	const uniqueMembers = new Map();
 		client.guilds.cache.each(guild => {
 			guildCount++
 			totalMembers += guild.memberCount;
 			guild.members.cache.each(member => {
-				if(!uniqueMembers.get(member.id)){
+				if(!uniqueMembers.has(member.id)){
 					uniqueMembers.set(member.id, true);
 				}
 			})
 		});
-	let uniqueMemberCount = uniqueMembers.size;
+	const uniqueMemberCount = uniqueMembers.size;
 	return {guildCount, totalMembers, uniqueMemberCount};
 }