Update aws-serverless-express.js

Removed express const and package (unused)

Author: rvanzon

Diff for: functions/aws-serverless-express.js

@@ -1,5 +1,4 @@
 /* example using https://github.com/awslabs/aws-serverless-express */
-import express from 'express'
 import awsServerlessExpress from 'aws-serverless-express'
 import binaryMimeTypes from './utils/binaryMimeTypes'
 import expressApp from './app'
@@ -15,4 +14,4 @@ const server = awsServerlessExpress.createServer(app, null, binaryMimeTypes)
 // Export Lambda handler
 exports.handler = (event, context) => {
   return awsServerlessExpress.proxy(server, event, context)
-}
+}