fix typo in parameters.py

[codecov-commenter]

Codecov Report

Merging #435 (c339587) into master (c9c91ae) will decrease coverage by 0.17%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #435      +/-   ##
==========================================
- Coverage   89.77%   89.59%   -0.18%     
==========================================
  Files          46       46              
  Lines        3383     3345      -38     
==========================================
- Hits         3037     2997      -40     
- Misses        346      348       +2     

Impacted Files	Coverage Δ
bluepyopt/ephys/parameters.py	88.34% <ø> (-0.12%)	:arrow_down:
bluepyopt/deapext/utils.py	95.23% <0.00%> (-1.64%)	:arrow_down:
bluepyopt/stoppingCriteria.py	87.50% <0.00%> (-1.39%)	:arrow_down:
bluepyopt/ephys/extra_features_utils.py	93.67% <0.00%> (-1.30%)	:arrow_down:
bluepyopt/ephys/responses.py	86.20% <0.00%> (-0.46%)	:arrow_down:
bluepyopt/deapext/CMA_MO.py	83.48% <0.00%> (-0.16%)	:arrow_down:
bluepyopt/deapext/optimisationsCMA.py	81.61% <0.00%> (-0.14%)	:arrow_down:
bluepyopt/ephys/evaluators.py	89.01% <0.00%> (-0.12%)	:arrow_down:
bluepyopt/ephys/parameterscalers.py	91.02% <0.00%> (-0.12%)	:arrow_down:
... and 27 more

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