fix jenkinsfile-create-dataset

Jenkinsfile_create_dataset

@@ -13,7 +13,7 @@ pipeline {
                 "KAGGLE_KEY=${params.KAGGLE_KEY}" ]) {
                     sh 'chmod +x script-zadanie-2-4.sh'
                     sh './script-zadanie-2-4.sh'
-                    sh 'head -n ${params.CUTOFF} train.csv > train.csv'
+                    sh "head -n ${params.CUTOFF} train.csv > train.csv"
                 }
             }
         }