message: Add circleci badge
diff: # CosmWasm
  +[![CircleCI](https://circleci.com/gh/confio/cosmwasm/tree/master.svg?style=svg)](https://circleci.com/gh/confio/cosmwasm/tree/master)
  +
  **Web Assembly Smart Contracts for the Cosmos SDK**
  This repo provides a useful functionality to build smart contracts that
  