MAINT: Loosen installation restrictions

[mgxd]

Since sdcflows is nipreps middleware and will be used by various tools, we should not be overtly strict on installations.

[codecov-commenter]

Codecov Report

Merging #269 (913aec2) into master (56a02bf) will increase coverage by 4.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
+ Coverage   83.09%   87.35%   +4.26%     
==========================================
  Files          25       25              
  Lines        1851     1851              
  Branches      278      278              
==========================================
+ Hits         1538     1617      +79     
+ Misses        281      204      -77     
+ Partials       32       30       -2     

Flag	Coverage Δ
travis	83.09% <ø> (ø)
unittests	87.25% <ø> (?)

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

Impacted Files	Coverage Δ
sdcflows/workflows/outputs.py	93.54% <0.00%> (+1.61%)	⬆️
sdcflows/interfaces/reportlets.py	89.83% <0.00%> (+1.69%)	⬆️
sdcflows/interfaces/bspline.py	87.44% <0.00%> (+4.18%)	⬆️
sdcflows/interfaces/fmap.py	87.35% <0.00%> (+14.94%)	⬆️
sdcflows/workflows/fit/syn.py	69.82% <0.00%> (+21.30%)	⬆️
sdcflows/utils/phasemanip.py	94.02% <0.00%> (+28.35%)	⬆️

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[mgxd]

i'm not sure why pypy is installed and not cpython... is this just a case of the cache needing to be cleared?

[effigies]

We had this issue a couple weeks ago with niworkflows or something. I think the conda-forge builds of Python are now treating cpython and pypy as variant builds of Python, and pypy is lexically later than cpython so is seen as more recent by the resolver.

Sometimes.

[mgxd]

I guess clearing the cache worked... good to merge?

[effigies]

We'll see.