message: Fix broken package name in README
diff: [![npm version](https://img.shields.io/npm/v/@cosmjs/crypto.svg)](https://www.npmjs.com/package/@cosmjs/crypto)
  -@iov/cosmjs contains low-level cryptographic functionality used in other @cosmjs
  -libraries. Little of it is implemented here, but mainly it is a curation of
  -external libraries along with correctness tests. We add type-safety, some more
  -checks, and a simple API to these libraries. This can also be freely imported
  -outside of CosmJS based applications.
  +This package contains low-level cryptographic functionality used in other
  +@cosmjs libraries. Little of it is implemented here, but mainly it is a curation
  +of external libraries along with correctness tests. We add type-safety, some
  +more checks, and a simple API to these libraries. This can also be freely
  +imported outside of CosmJS based applications.
  ## License
  