Add Elo cards support

Merge pull request #19 from freelancehunt/change-travis-url

Change Travis CI url

3.2.1

Change deprecated syntax to substr function.

3.2.0: Replace Depreciated Curly Braces with Brackets (#8)

• Require php >= 7.2
• Fix php 7.4 deprecations
• Add tests for php 7.4

Allow card number validation against several types

Merge pull request #7 from freelancehunt/multiple-card-types-validation

Allow pass multiple card types for validation. Declare constants for card types.

3.0.0: Merge pull request #5 from freelancehunt/flatten-package

• Breaking change: change package name to Freelancehunt\Validators
• Add version and PHP version badges
• Reorder author list
• Updated README and lib-pcre version requirement according to http://php.net/manual/ru/pcre.installation.php.

2.0.0

• Require php >= 7.1
• Move to codecov for code coverage
• Support 19-digit VISA cards
• Support Mastercard 2-series BINs
• Code style updates