added PosMobile service (#20)

* added PosMobile service

* updated service update

Author: DjoykeAbyah

buildSrc/src/main/groovy/adyen.sdk-automation-conventions.gradle

@@ -18,6 +18,7 @@ List<Service> services = [
         new Service(name: 'Payout', version: 68),
         new Service(name: 'Recurring', version: 68, small: true),
         new Service(name: 'BinLookup', version: 54, small: true),
+        new Service(name: 'PosMobile', spec: 'SessionService', version: 68, small: true), 
         // Point of Sale
         new Service(name: 'PosTerminalManagement', spec: 'TfmAPIService', version: 1, small: true),
         // Management