Fix incompatible change in marsmallow (#76)

Co-authored-by: shaquille <crimsonmedia96@gmail.com>

Author: shaquille-lab

src/commercetools/services/product_projections.py

@@ -41,7 +41,7 @@ def text_serialize(self, value):
         return result
 
     @post_dump
-    def merge_text(self, data):
+    def merge_text(self, data, **kwargs):
         value = data.pop("text")
         data.update(value)
         return data