message: Add cosmwasm-storage on crates.io badge
diff: # cosmwasm-storage
  +[![cosmwasm-storage on crates.io](https://img.shields.io/crates/v/cosmwasm-storage.svg)](https://crates.io/crates/cosmwasm-storage)
  [![CircleCI](https://circleci.com/gh/CosmWasm/cosmwasm/tree/master.svg?style=shield)](https://circleci.com/gh/CosmWasm/cosmwasm/tree/master)
  CosmWasm library with useful helpers for Storage patterns. You can use `Storage`
  