title: Flask migration error
body: <p>I've got an application build on flask and I wanted to create a new migration for it today. When I run         <code>$python manage.py db upgrade</code> </p>
  
  <p>i got the message  </p>
  
  <p>raise util.CommandError('Only a single head is supported. The '
  alembic.util.CommandError: Only a single head is supported. The script directory has multiple heads (due to branching), which must be resolved by manually editing the revision files to form a linear sequence. Run <code>alembic branches</code> to see the divergence(s).</p>
  
  <p>So i run this command       <code>$alembic branches</code>
    No config file 'alembic.ini' found, or file has no '[alembic]' section</p>
  
  <p>Any clue on what is this about?</p>