add discountCodes to import API project api root

Author: jenschude

commercetools/commercetools-sdk-java-importapi/src/main/java/com/commercetools/importapi/client/ProjectApiRoot.java

@@ -107,6 +107,11 @@ public ByProjectKeyTypesRequestBuilder types() {
         return with().types();
     }
 
+    @Override
+    public ByProjectKeyDiscountCodesRequestBuilder discountCodes() {
+        return with().discountCodes();
+    }
+
     @Override
     public void close() {
         if (apiHttpClient == null) {

commercetools/commercetools-sdk-java-importapi/src/main/java/com/commercetools/importapi/client/ProjectScopedApiRoot.java

@@ -33,4 +33,6 @@ public interface ProjectScopedApiRoot {
     ByProjectKeyInventoriesRequestBuilder inventories();
 
     ByProjectKeyTypesRequestBuilder types();
+
+    ByProjectKeyDiscountCodesRequestBuilder discountCodes();
 }