fix(ignored-modifiers): enables css util in modifiers

[andrewtpoe]

OVERVIEW

fixes #19

This PR enables the css util from styled components in the modifier config. Previously this util was only useable if you were using the returned object pattern.

WHERE SHOULD THE REVIEWER START?

lib/utils/tests/modifiedStyles.js

HOW CAN THIS BE MANUALLY TESTED?

Run the test suite.

ANY NEW DEPENDENCIES ADDED?

lodash.isarray - an additional util from the lodash family.

CHECKLIST

Be sure all items are ✅ before submitting a PR for review.

• [x] Verify the linter and tests pass: npm run review
• [x] Verify this branch is rebased with the latest master

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[andrewtpoe]

I've updated this PR to add styled-components and use the imported css util as you suggested @andrefgneves