Implement readability improvement suggested by poeti8

server/redis.js

@@ -2,10 +2,7 @@ const { promisify } = require('util');
 const redis = require('redis');
 const config = require('./config');
 
-const client = redis.createClient(
-  config.REDIS_PORT ? config.REDIS_PORT : 6379,
-  config.REDIS_HOST ? config.REDIS_HOST : '127.0.0.1'
-);
+const client = redis.createClient(config.REDIS_PORT || 6379, config.REDIS_HOST || '127.0.0.1');
 
 exports.get = promisify(client.get).bind(client);
 exports.set = promisify(client.set).bind(client);