change in jenkins file

Jenkinsfile

@@ -36,8 +36,9 @@ pipeline {
                     virtualenv venv
                     #. venv/bin/activate
                     export PATH=${VIRTUAL_ENV}/bin:${PATH}
+                    pip install --upgrade pip
                     pip install -r requirements.txt -r dev-requirements.txt
-                    make -f Makefile clean
+                    make clean
                 """
             }
         }