update requirement

Author: mdprotacio

composer.json

@@ -16,7 +16,7 @@
         "psr-0": { "Omnipay\\Ecopayz\\" : "src/" }
     },
     "require": {
-        "omnipay/common": "^3.0.0"
+        "omnipay/common": "^2.0||^3.0"
     },
     "require-dev": {
         "omnipay/tests": "^3.0.0",