[Bugfix] Remove remnant function write_batching_history()

[nitinkedia7]

Fixes #37.
We remove the function call self._scheduler.write_batching_history() as this function doesn't exist.
Detailed batching history can be obtained by using the --metrics_config_keep_individual_batch_metrics flag..
This produces batch_metrics.json which contains information about every iteration. Not that it is expensive to log this information as it scales linearly to the number of batches.

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