fix: add title and badges to Readme

Author: brettstack

README.md

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+# AWS Serverless Express
+[![Build Status](https://travis-ci.org/awslabs/aws-serverless-express.svg?branch=master)](https://travis-ci.org/awslabs/aws-serverless-express) [![npm](https://img.shields.io/npm/v/aws-serverless-express.svg)]() [![npm](https://img.shields.io/npm/dm/aws-serverless-express.svg)]()
+
 Run serverless applications and REST APIs using your existing [Node.js](https://nodejs.org/) application framework, on top of [AWS Lambda](https://aws.amazon.com/lambda/) and [Amazon API Gateway](https://aws.amazon.com/api-gateway/). The sample provided allows you to easily build serverless web applications/services and RESTful APIs using the [Express](https://expressjs.com/) framework.
 
 ## Getting Started