Switched default ImageChartsQRCodeProvider to QRServerProvider

image-charts.com decided to start watermarking QR codes...

Replaced google image charts with image-charts.com

Google image charts has gone dark; replaced the GoogleQRCodeProvider with ImageChartsQRCodeProvider

Minor (internal) refactoring

Improved verifyCode() a little.

Fix a bug that caused timeslices to be returned instead of the intended timeslice

Ouch. Sorry. My bad.

Dropped support for PHP versions below 5.4 and HHVM

• Dropped support for PHP versions below 5.4 and HHVM
• Fixed a deprecation notice in the MCryptRNGProvider for PHP 7.1
• Fixed an issue in the HashRNGProvider for PHP 7.2+

Minor changes

• ConvertUnixTimeDotComTimeProvider was dropped; this seems to no longer be online / work
• A new NTPTimeProvider was added
• The verifyCode(...) method now has a new argument that returns the timeslice that matched the code so you can save the timeslice and prevent replay-attacks.

Minor bugfix

Fixed a bug in ConvertUnixTimeDotComTimeProvider that used caching by accident.

Implemented time providers to ensure correct time is used.

* Fix TwoFactorAuth class actually uses the TimeProvider

* Update README and DEMO to advise using 160+ bits secret

Switched to PSR-4 autoloading standard

1.5.2

Update composer.json

Changed getQRText() from private to public

1.5.1

Update composer.json