FIX: antsRegistration allows the restrict_deformation to be float

[oesteban]

Minimal bugfix

[codecov]

Codecov Report

Merging #3387 (7362004) into master (9e127cf) will decrease coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3387      +/-   ##
==========================================
- Coverage   65.13%   64.87%   -0.27%     
==========================================
  Files         307      307              
  Lines       40372    40363       -9     
  Branches     5336     5336              
==========================================
- Hits        26297    26184     -113     
- Misses      13003    13085      +82     
- Partials     1072     1094      +22     

Flag	Coverage Δ
unittests	64.87% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nipype/interfaces/ants/registration.py	73.09% <ø> (ø)
nipype/interfaces/r.py	45.83% <0.00%> (-37.51%)	⬇️
nipype/interfaces/nipy/base.py	80.00% <0.00%> (-20.00%)	⬇️
nipype/testing/utils.py	70.90% <0.00%> (-18.19%)	⬇️
nipype/workflows/__init__.py	88.23% <0.00%> (-11.77%)	⬇️
nipype/interfaces/freesurfer/base.py	65.32% <0.00%> (-11.30%)	⬇️
nipype/info.py	78.12% <0.00%> (-9.38%)	⬇️
nipype/__init__.py	46.80% <0.00%> (-6.39%)	⬇️
nipype/pkg_info.py	75.00% <0.00%> (-6.25%)	⬇️
nipype/pipeline/plugins/linear.py	79.16% <0.00%> (-4.17%)	⬇️
... and 26 more

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