Update Dev Deps to WP6.1

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• [x] Min PHP7.2 (Drop all support for PHP7.1)
• [x] Tests on WP5.9 | WP6.0 | WP61
• [x] Shared Badges
• [x] Project on Codecov
• [x] Project on Scrutizer
• [x] Project on codeclimate
• [x] Project Dev Dependencies
• [x] Uusing .env for test wp-config This has partially been done

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