0.007   2018-03-17 (PERLANCAR)

	- No functional changes.

	- [doc] Update/fix Synopsis.


0.006   2018-03-17 (PERLANCAR)

	- sell() returns actual units sold.


0.005   2018-03-16 (PERLANCAR)

        - Add cost accounting method 'weighted average'.

        - Add more examples to Synopsis (FIFO, weighted average, overselling).


0.004   2018-03-16 (PERLANCAR)

	- [Bugfix] Fix regression bug introduced by the last optimization.


0.003   2018-03-15 (PERLANCAR)

	- [opt] Merge purchases with same price to the last inventory
	  record.


0.002   2018-03-15 (PERLANCAR)

	- [Incompatible change] Remove summary() and replace it with units() and
          average_purchase_price().

        - Add argument: allow_negative_inventory.

        - sell() now returns realized profits.


0.001   2018-03-09 (PERLANCAR)

        - First release.
