[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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