Update README.md

[hassankhan]

This is a Feature Proposal

Description

There's a few minor nitpicks in the README.md file. It would also be nice to have badges for NPM etc. for getting project status quickly.

[hassankhan]

Some examples:

https://github.com/elastic-coders/serverless-webpack/blame/master/README.md#L6
https://github.com/elastic-coders/serverless-webpack/blame/master/README.md#L119

[HyperBrain]

I have working badges for NPM, Travis and Coveralls in the alias plugin (they create svg badges for smooth rendering): https://github.com/HyperBrain/serverless-aws-alias/blob/master/README.md