Restore deprecated previous property project_folder_id

Author: cstenac

dataikuapi/dss/projectfolder.py

@@ -1,4 +1,5 @@
 from .project import DSSProject
+import warnings
 
 class DSSProjectFolder(object):
     """
@@ -22,6 +23,14 @@ def id(self):
         """
         return self._data["id"]
 
+    @property
+    def project_folder_id(self):
+        """
+        deprecated, use id instead
+        """
+        warnings.warn("DSSProjectFolder.project_folder_id is deprecated, please use id", DeprecationWarning)
+        return self.id
+
     @property
     def name(self):
         """