old_contents: """
  Flexx is a pure Python toolkit for creating graphical user interfaces
  (GUI's), that uses web technology for its rendering. Apps are written
  purely in Python; Flexx' transpiler generates the necessary JavaScript
  on the fly.
  
  You can use Flexx to create (cross platform) desktop applications, web
  applications, and (if designed well) export an app to a standalone HTML
  document. It also works in the Jupyter notebook.
  
  The docs are on `Readthedocs <http://flexx.readthedocs.io>`_,
  the code is on `Github <http://github.com/zoofio/flexx>`_,
  and there is a `demo server <http://flexx1.zoof.io>`_.
  Flexx is currently in alpha status; any part of the public API may
  change without notice. Feedback is welcome.
  
  ----
  
  Flexx has a modular design, consisting of a few subpackages, which can
  also be used by themselves:
  
  * flexx.ui - the widgets
  * flexx.app - the event loop and server
  * flexx.event - properties and events
  * flexx.pyscript - Python to JavaScript transpiler
  * flexx.webruntime - to launch a runtime
  * flexx.util - utilities
  
  For more information, see http://flexx.readthedocs.io.
  """
  
  # NOTES ON DOCS:
  # There are 2 places that define the short summary of Flexx: the
  # __init__.py and the README.md. Their summaries should be kept equal.
  # The index.rst for the docs uses the summary from __init__.py (the
  # part after the "----" is stripped. The long-description for Pypi is
  # obtained by converting README.md to RST.
  
  __version__ = '0.4'
  
  
  # Assert compatibility and redirect to legacy version on Python 2.7
  import sys
  ok = True
  if sys.version_info[0] == 2:  # pragma: no cover
      if sys.version_info < (2, 7):
          raise RuntimeError('Flexx needs at least Python 2.7')
      if type(b'') == type(''):  # noqa - will be str and unicode after conversion
          sys.modules[__name__] = __import__(__name__ + '_legacy')
          ok = False
  
  # Import config object
  if ok:
      from ._config import config  # noqa
      from .util.logging import set_log_level  # noqa
      set_log_level(config.log_level)
      
  del sys, ok
  
new_contents: """
  Flexx is a pure Python toolkit for creating graphical user interfaces
  (GUI's), that uses web technology for its rendering. Apps are written
  purely in Python; Flexx' transpiler generates the necessary JavaScript
  on the fly.
  
  You can use Flexx to create (cross platform) desktop applications, web
  applications, and (if designed well) export an app to a standalone HTML
  document. It also works in the Jupyter notebook.
  
  The docs are on `Readthedocs <http://flexx.readthedocs.io>`_,
  the code is on `Github <http://github.com/zoofio/flexx>`_,
  and there is a `demo server <http://flexx1.zoof.io>`_.
  Flexx is currently in alpha status; any part of the public API may
  change without notice. Feedback is welcome.
  
  ----
  
  Flexx has a modular design, consisting of a few subpackages, which can
  also be used by themselves:
  
  * flexx.ui - the widgets
  * flexx.app - the event loop and server
  * flexx.event - properties and events
  * flexx.pyscript - Python to JavaScript transpiler
  * flexx.webruntime - to launch a runtime
  * flexx.util - utilities
  
  For more information, see http://flexx.readthedocs.io.
  """
  
  # NOTES ON DOCS:
  # There are 2 places that define the short summary of Flexx: the
  # __init__.py and the README.md. Their summaries should be kept equal.
  # The index.rst for the docs uses the summary from __init__.py (the
  # part after the "----" is stripped. The long-description for Pypi is
  # obtained by converting README.md to RST.
  
  __version__ = '0.4.0-dev'
  
  
  # Assert compatibility and redirect to legacy version on Python 2.7
  import sys
  ok = True
  if sys.version_info[0] == 2:  # pragma: no cover
      if sys.version_info < (2, 7):
          raise RuntimeError('Flexx needs at least Python 2.7')
      if type(b'') == type(''):  # noqa - will be str and unicode after conversion
          sys.modules[__name__] = __import__(__name__ + '_legacy')
          ok = False
  
  # Import config object
  if ok:
      from ._config import config  # noqa
      from .util.logging import set_log_level  # noqa
      set_log_level(config.log_level)
      
  del sys, ok
  
subject: bump version to dev