[REF] io.open() → open()

[DimitriPapadopoulos]

Summary

In Python 3, io.open() is an alias for the builtin open() function:
https://docs.python.org/3/library/io.html#io.open

List of changes proposed in this PR (pull-request)

• io.open() → open()

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.04 ⚠️

Comparison is base (6cbbaff) 63.33% compared to head (c8f4c42) 63.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3575      +/-   ##
==========================================
- Coverage   63.33%   63.30%   -0.04%     
==========================================
  Files         309      309              
  Lines       40908    40908              
  Branches     5383     5383              
==========================================
- Hits        25911    25895      -16     
- Misses      13989    14004      +15     
- Partials     1008     1009       +1     

Impacted Files	Coverage Δ
nipype/sphinxext/plot_workflow.py	14.95% <0.00%> (ø)

... and 3 files with indirect coverage changes

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