Exported LottieProps type

[kb-ig]

fixes #46

Small change to export the LottieProps type. It can now be imported by consumers of the library, using

import { LottieProps } from "react-lottie-player";

To verify:

• [ ] Versioning (not increment as part of this PR - is this required?)
• [ ] Tests (snapshot tests fail on my machine regardless of this change)

[mifi]

lgtm! thanks