title: Fastlane plugin app center giving Provided app_name: 'helloworldtest" is not in a valid format
body: <p>I am having problem with uploading the ipa in app center using fastlane app center plugin.
  When I run <code>fastlane test_autocreation  --verbose</code>, I am getting this error:</p>
  
  <blockquote>
    <p>Provided app_name: 'helloworldtest" is not in a valid format.Please ensure no special characters or spaces in the app_name.</p>
  </blockquote>
  
  <p>Here's the lane that is responsible in doing it:</p>
  
  <pre><code> lane :test_autocreation do
        appcenter_upload(
          api_token: "******",
          owner_type: "organization",
          owner_name: "*****",
          app_os: "ios",
          app_name: "helloworldtest",
          ipa: "./build_Dev/helloworldtest.ipa",
          destinations: "*"
        )
      end
  </code></pre>
  
  <p>Is there something that I may have missed?</p>