Added ping command

commands/ping.js

+exports.run = async (client, message, args, connection) => {
+    message.channel.send(`Pong! ${client.ws.ping}ms`).catch(e => {
+        return;
+    });
+};
+
+module.exports.help = {
+    name: 'ping',
+    aliases: ['pong']
+};
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