message: Add height to BrowserStack logo in README
diff: <p align="center">
  <a href="https://www.browserstack.com">
  - <img src="https://davidcetinkaya.github.io/embla-carousel/build/img/browserstack-logo.svg" width="45" />
  + <img src="https://davidcetinkaya.github.io/embla-carousel/build/img/browserstack-logo.svg" width="45" height="45" />
  </a>
  </p>
  