Don't push code coverage when on hhvm environment.

Signed-off-by: crynobone <crynobone@gmail.com>
Update travis

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.1' into 2.2
Utilize `Illuminate\Support\Arr`.

Signed-off-by: crynobone <crynobone@gmail.com>
Update changelog.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.2'