def update(self, incr=<NUM_LIT:1>, force=False):
self.count += incr<EOL>self.parent.update(incr, force)<EOL>
Args:
    incr(int): Amount to increment ``count`` (Default: 1)
    force(bool): Force refresh even if ``min_delta`` has not been reached

Increment progress bar and redraw

Both this counter and the parent are incremented.

Progress bar is only redrawn if min_delta seconds past since the last update on the parent.