Add strip color property (#106)

* feat: add strip color property, source: https://stackoverflow.com/a/22587039

* chore: fix nunomaduro/phpinsights version

* tests: add strip color test

* doc: add comment for undocumented property

Fix pass nfc property into NfcInterface, remove addNfc(), refactor se…

…tNfc(), add tests (#105)

* Change pass nfc property to NfcInterface, refactor addNfc(), setNfc(), getNfc(), validateNfcKeys()
* Remove addNfc(), change setNfc(), add testNfc(), testAddingNfcTag()
* phpcs hotfixes

Merge pull request #103 from eymengunay/maintenance-work

Merge pull request #99 from endsoonconfess/issue-97-missing-return-ty…

…pe-deprecation-notice

Merge pull request #90 from JeroenMoonen/patch-1

Fix strict type issue

Merge pull request #89 from hervehobbes/master

Added NFC support

grouping identifier validation fixed

[Minor] Composer version alias bump

[bc] 3x image support