Fixed linter errors

src/models/index.js

@@ -12,6 +12,11 @@ db.items = require('./item.js')(sequelize, Sequelize);
 
 module.exports = db;
 
+/**
+ * Initializes a sequelize database connection.
+ *
+ * @return {object} - sequelize connection
+ */
 function initDatabase() {
   let sequelize = null;
 
@@ -21,7 +26,10 @@ function initDatabase() {
       storage: dbConfig.get('connection_string'),
     });
   } else {
-    sequelize = new Sequelize(dbConfig.get('name'), dbConfig.get('username'), dbConfig.get('password'), {
+    const dbName = dbConfig.get('name');
+    const dbUsername = dbConfig.get('username');
+    const dbPassword = dbConfig.get('password');
+    sequelize = new Sequelize(dbName, dbUsername, dbPassword, {
       dialect: dbConfig.get('driver'),
       host: dbConfig.get('address'),
     });