blackrockio.py: Fix typo.
blackrockio.py: Fix typo.

INM-6/python-neo,samuelgarcia/python-neo,Blackfynn/python-neo,CINPLA/python-neo,apdavison/python-neo,theunissenlab/python-neo,SummitKwan/python-neo,mgr0dzicki/python-neo,rgerkin/python-neo,NeuralEnsemble/python-neo,guangxingli/python-neo,JuliaSprenger/python-neo