Fix breaking issue in package.json

[alvaromontoro]

Fix typo on package.json that breaks the whole build

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

There is a typo on package.json in the list of collaborators, and it's breaking the build. No code change involved.

Link(s)

• Commit in which the issue was added

Screenshot(s)

N/A

Checklist:

• I have thoroughly read the CONTRIBUTING guidelines.
• I understand my pull request will be thoroughly reviewed at high detail.
• I understand the work in my pull request will only be available in the next version release of Checka11y.css and not in the current version release.
• I confirm the work in this pull request is valid according to my findings and is not something for anything personal.
• I have updated the README where and if applicable (still put an x if you have considered this but thought there was nothing to add or modify).
• I have added myself to the contributors section in package.json (still put an x if you have considered this but decided not to add yourself).
• I have checked I have not committed any accidental files.
• I have tested all the main modern browsers (I.e. Chrome, Firefox, Edge, Safari - please leave this unchecked if there were any browsers listed you could not test and list them in the help section with details why you couldn't test that browser)
• All new and existing a11y checks still work correctly (compare your local test/index.html to the test/index.html in the master branch).

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