fix(contrast-colors): replace depreciated colorspace

[karim-semmoud]

Description

This PR aims at replacing the depreciated use of colorspace in favor of colorSpace across Contrast Colors lib, test and documentation

Closes #280

Motivation

This allows a better developer experience by removing the depreciated log and lint message on the latest version

To-do list

• [ x] I have read the CONTRIBUTING document.
• [x ] Local test passes using moon
• This pull request is ready to merge.

Note

Despite the colorspace still available for backward compatibility, the update of the README only refers to the latest colorSpace naming

[changeset-bot]

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Latest commit: 079bbdd

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[karim-semmoud]

Waiting for CLI test to be approved and pass before marking this PR as "ready to merge"
Note: Test are passing locally with moon and ava