message: Path: Add `realpath`.
diff: @@ -845,6 +845,14 @@ class Path:
  virtual = self.__virtual,
  volume = self.__volume)
  + def realpath(self):
  + """The absolute path of the real file represented by this path.
  +
  + >>> Path('./foo/../bar').realpath() == '{}/bar'.format(_OS.getcwd())
  + True
  + """
  + return Path(_OS.path.realpath(str(self)))
  +
  def touch(self):
  """Create the designated file if it does not exists.
  