REL: 1.8.4

[mgxd]

Preparation for the 1.8.4 release, to be merged immediately pending tests passing.

Critical fixes in #3501

Quick issues/PRs:

• ... Please let me know if you want to try to merge something today.

Release checklist

• Merge pending PRs
• Update changelog
• Update .mailmap
• Update .zenodo.json
• Set release number in nipype/info.py
• Update doc/interfaces.rst with previous releases
• Check conda-forge feedstock build (REL: 1.8.4 conda-forge/nipype-feedstock#87)
• Tutorial tests (TEST: nipype 1.8.4 miykael/nipype_tutorial#179)

[codecov]

Codecov Report

Merging #3503 (e918b2d) into master (4a91e88) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3503   +/-   ##
=======================================
  Coverage   65.25%   65.25%           
=======================================
  Files         309      309           
  Lines       40859    40859           
  Branches     5379     5379           
=======================================
  Hits        26663    26663           
- Misses      13122    13126    +4     
+ Partials     1074     1070    -4     

Flag	Coverage Δ
unittests	65.03% <100.00%> (ø)

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

Impacted Files	Coverage Δ
nipype/info.py	87.50% <100.00%> (ø)
nipype/algorithms/icc.py	58.97% <0.00%> (ø)
nipype/interfaces/fsl/utils.py	64.46% <0.00%> (ø)

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