Clean libs dir

Jenkinsfile

@@ -18,7 +18,7 @@ node {
          * First, the incremental build number from Jenkins
          * Second, the 'latest' tag.
          * Pushing multiple tags is cheap, as all the layers are reused. */
-        app.push("devel")  
+        app.push("devel")
         
     }
     stage('Cleaning'){

build.gradle

@@ -8,6 +8,7 @@ buildscript {
     }
 }
 
+apply plugin: 'base'
 apply plugin: 'java'
 apply plugin: 'eclipse'
 apply plugin: 'idea'
@@ -26,6 +27,7 @@ targetCompatibility = 1.8
 
 
 jar {
+    delete "${buildDir}/libs/"
     baseName = 'DiscordBot'
 
 }