Update composer.json

Update composer.json

Update composer.json

Merge pull request #78 from thephpleague/barryvdh-mandateid

Add MandateId

Merge pull request #72 from pascalbaljet/master

Added Content-Type header

Update Gateway.php

Add newline to message

Merge pull request #53 from mollie/issue-51/fix-send-request

Only json_encode data when there is data. Fixes #51

Merge pull request #50 from mollie/travis-composer-examples

Add basic example and do some changes to composer and travis

Merge pull request #49 from mollie/v2-omnipay-mollie

V2 omnipay mollie