Removed unset() which breaks PHP 7.1 compatibility

Release 2.8.1

Merge branch 'annuh-master'

Release 2.7.0 🎉

2.6.0 release

2.5.1 release

This time for sure.

Merge branch 'master' of github.com:hybridauth/hybridauth

bumb for 2.4.0

Year and version bump

Also revert index.php code from hybridauth#381