title: publish my android aar to jcenter
body: <p>I want to upload my android aar to the <a href="https://bintray.com/" rel="nofollow noreferrer">bintray</a>.I reafer to <a href="https://stackoverflow.com/questions/29655103/publish-android-library-to-jcenter-gradle-bintrayupload-does-not-find-libraries">this</a> ,but when I execute the cmd <code>#gradlew bintrayUpload</code>,the cmd show <a href="https://i.stack.imgur.com/r8ItX.png" rel="nofollow noreferrer">error message</a>,and my gradle file as follow:</p>
  
  <pre><code>bintray {
      user = properties.getProperty('bintray.user')
      key = properties.getProperty('bintray.apikey')
      configurations = ['published', 'archives']
  
      dryRun = false
      publish = true
  
      pkg {
          repo = 'maven'
          name = 'ActionAnimatorSet'
  
          desc = 'An animator operation set on Android'
  
          websiteUrl = 'https://github.com/paulyung541/ActionAnimatorSet'
          issueTrackerUrl = 'https://github.com/paulyung541/ActionAnimatorSet/issues'
          vcsUrl = 'https://github.com/paulyung541/ActionAnimatorSet.git'
  
          licenses = ['GNU GENERAL PUBLIC LICENSE, Version 3.0']
          labels = ['Android', 'ObjectAnimator', 'AnimatorSet']
          publicDownloadNumbers = true
  
          version {
              name = '1.0.0'
              desc = 'first version'
              vcsTag = '1.0'
          }
      }
  }
  
  publishing {
      publications {
          Publication(MavenPublication) {
              groupId 'com.paulyung'
              artifactId 'actionanimset'
              version '1.0.0'
          }
      }
  }
  </code></pre>
  
  <p>I already setup a maven in bintray,but the cmd always point out that I don't have a maven.</p>