message: drake: Install `drake/deprecation.py`.
diff: @@ -26,6 +26,7 @@ def configure(prefix = '.', coverage: bool = False):
  'src/drake/__init__.py',
  'src/drake/air.py',
  'src/drake/enumeration.py',
  + 'src/drake/deprecation.py',
  'src/drake/docker.py',
  'src/drake/imagemagick.py',
  'src/drake/cxx/__init__.py',
  