Add status badge to README

- minor formatting updates

Author: Danny Croft

README.md

@@ -1,5 +1,7 @@
 [![Build Status](https://travis-ci.org/dannycroft/aws-lambda-test-helper.svg?branch=master)](https://travis-ci.org/dannycroft/aws-lambda-test-helper)
 
+[![NPM](https://nodei.co/npm/aws-lambda-test-helper.png)](https://nodei.co/npm/aws-lambda-test-helper/)
+
 ## A promise based test helper for running node aws lambda functions
 
 Simple, lightweight tool to help with testing AWS Lambda functions. No dependencies to run.
@@ -50,8 +52,10 @@ All config resource paths should be based from your project root. See `./test/mo
 ```
 
 ### Install
+
 #### With NPM
 `npm i -D aws-lambda-test-helper`
+
 #### Without NPM
 Inside your project clone this repo: `git clone https://github.com/dannycroft/aws-lambda-test-helper.git` then require it from inside your tests `const runLambda = require('../aws-lambda-test-helper');`