message: Add Badges to top level readme
diff: # CosmWasm
  -[![CircleCI](https://circleci.com/gh/confio/cosmwasm/tree/master.svg?style=svg)](https://circleci.com/gh/confio/cosmwasm/tree/master)
  +[![CircleCI](https://circleci.com/gh/confio/cosmwasm/tree/master.svg?style=shield)](https://circleci.com/gh/confio/cosmwasm/tree/master)
  +[![Docs](https://docs.rs/cosmwasm/badge.svg)](https://docs.rs/cosmwasm)
  +[![crates.io](https://img.shields.io/crates/v/cosmwasm.svg)](https://crates.io/crates/cosmwasm)
  +
  **Web Assembly Smart Contracts for the Cosmos SDK**
  