This release:

• Prepared for a variety of base images by setting up a cloud build matrix:
  #25
• Added better documentation for gcloud auth configure-docker
  #26
• Added close() to TqdmFile, preventing an error when piping stdout:
  #30
• tqdm progress bars and other interactive outputs now display correctly in
  caliban run outputs. stdout flushes properly! Before these changes,
  stderr would appear before any stdout, making it difficult to store the
  logs in a text file. Now, by default, python processes launched by caliban run won't buffer. #31

Thanks to @dthiagarajan for reporting an issue that led to this work.