Fix make clean

Author: Armavica

Makefile

@@ -52,8 +52,10 @@ help:
 
 clean:
 	rm -rf $(BUILDDIR)/*
+	rm -rf $(SOURCEDIR)/api/generated
 	rm -rf $(SOURCEDIR)/api/**/generated
 	rm -rf $(SOURCEDIR)/api/**/classmethods
+	rm -rf $(SOURCEDIR)/contributing/private_api/generated
 	rm -rf $(SOURCEDIR)/contributing/private_api/**/generated
 	rm -rf $(SOURCEDIR)/contributing/private_api/**/classmethods
 	rm -rf docs/jupyter_execute