title: Broken DAG: No module named 'airflow.contrib.gsc_to_gcs'
body: <p>Very new to Airflow/Python etc. but can't seem to work out what I need to do to resolve this issue..</p>
  
  <p>Airflow is running on Puckel/Docker</p>
  
  <p>Full error is:</p>
  
  <pre><code>Broken DAG : [/usr/local/airflow/dags/xxxx.py] No module named 'airflow.contrib.operators.gsc_to_gcs'
  </code></pre>
  
  <p>In the python code, I've written:</p>
  
  <pre><code>from airflow.contrib.operators.gcs_to_gcs import GoogleCloudStorageToGoogleCloudStorageOperator
  </code></pre>
  
  <p>I'm guessing I need to install the <code>gcs_to_gcs</code> module, but I'm not sure how to do this.</p>
  
  <p>Any specific instructions would be greatly appreciated :-)</p>