Update 'Jenkinsfile'

Jenkinsfile

@@ -1,28 +1,24 @@
 pipeline {
     agent any
-    stages {
-		 stage('Preparation') { 
-			properties([
-				parameters([
+	parameters{
 		string(
 			defaultValue: 'kaerde',
 			description: 'Kaggle username',
 			name: 'KAGGLE_USERNAME',
 			trim: false
-					),
+		)
 		password(
 			defaultValue: '36b8c984addfb7a043d772a9c6b23a1f',
 			description: 'Kaggle token taken from kaggle.json file, as described in https://github.com/Kaggle/kaggle-api#api-credentials',
 			name: 'KAGGLE_KEY'
-					),
+		)
 		string(
 			defaultValue: '130000',
 			description: 'wielkość odcięcia zbioru danych',
 			name: 'CUTOFF'
 		)
-				])
-			])
 	}
+    stages {
         stage('Stage 1') {
             steps {
 				withEnv(["KAGGLE_USERNAME=${params.KAGGLE_USERNAME}",