message: Remove stale build badges from README
diff: # Tink
  -**`Ubuntu`** | **`macOS`**
  ------------------------------------------------------------------------------------------ | -----------
  -![Kokoro Ubuntu](https://storage.googleapis.com/tink-kokoro-build-badges/tink-ubuntu.png) | ![Kokoro macOS](https://storage.googleapis.com/tink-kokoro-build-badges/tink-macos.png)
  -
  ## Introduction
  Using crypto in your application [shouldn't have
  