Add support for clipping imageOne

[zoltan-mihalyi]

Right now only imageTwo is clipped. Comparing two semi-transparent images would be a useful function.

[nerdyman]

@zoltan-mihalyi Ah yeah I ran into this myself with the images used in the readme. I'll take a look at clipping both.

Edit: Also open to PRs!

[nerdyman]

This has been resolved in v4. I need to do testing on other devices before doing a final release but there is a pre-release ready to go.

It can be installed by running:

pnpm i react-compare-slider@beta
# Or
yarn add react-compare-slider@beta
# Or
npm i react-compare-slider@beta