message: Add: readme builds section
diff: A set of utilities to interface with ethereum addresses
  +### Builds
  +
  +Building the project will output three versions of the library:
  +
  +```bash
  +yarn Build
  +```
  +
  +A UMD build to be used directly inside the browser as a script source _(both minified and un-minified versions)_. A `commonjs` modules build and an `es6` modules build.
  +
  +The `es6` version will also bring over the `flow` types used for this project.
  +
  ### Developing
  If you want to actively work on the modules, there's a `yarn` task that will watch the `src` folder and rebuild files if they were changed:
  