Update README.md

[SushantChandla]

Updated version in README.md from 0.0.3 to 0.0.4

[google-cla[bot]]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

:memo: Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

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[SushantChandla]

@googlebot I signed it!

[stuartmorgan]

Thanks, but that section of the README is simply intended to be representative of what using the unendorsed plugin will look like. The exact version someone wants to require for their app is, as with any package, up to them.