Fixed typo in PoisonedModel
Fixed typo in PoisonedModel

Fixed a simple typo where modelparams was called modelparameters.

csferrie/python-qinfer,QInfer/python-qinfer,ihincks/python-qinfer,whitewhim2718/python-qinfer,MichalKononenko/python-qinfer,Alan-Robertson/python-qinfer