old_contents: from sanic.app import Sanic
  from sanic.blueprints import Blueprint
  
  
  __version__ = "18.12.0"
  
  __all__ = ["Sanic", "Blueprint"]
  
new_contents: from sanic.app import Sanic
  from sanic.blueprints import Blueprint
  
  
  __version__ = "19.03.0"
  
  __all__ = ["Sanic", "Blueprint"]
  
subject: Bump version to 19.03.0