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**Fixed**
. `270 <https://github.com/pyexcel/pyexcel/issues/270>`_: apenddoc breaks
interpreter optimization
. `274 <https://github.com/pyexcel/pyexcel/issues/274>`_: Replace deprecated
imp module with importlib - enforced pyexcel's dependency on lml>=0.2.0. This
will have an implication for linux distribution makers for pyexcel. However,
this is a reaction to the potential removal of __import__ syntax.