Merge pull request #11 from igorkosteski/master

- Complete the ThreePartyRefundRequest

Merge pull request #7 from lucasnetau/sha256-fix

Skip vpc_SecureHash and vpc_SecureHashType params in SHA256 Hash Calculation

Merge pull request #2 from khaledkhamis/master

added migs refund support

Update .travis.yml

PSR-4

Update dependencies