DOC: Clarify integration plans with *NiBabel* in the README

[oesteban]

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[codecov-commenter]

Codecov Report

Merging #128 (d982d6a) into master (d91f9ae) will not change coverage.
The diff coverage is n/a.

❗ Current head d982d6a differs from pull request most recent head 5c295c4. Consider uploading reports for the commit 5c295c4 to get more accurate results

@@           Coverage Diff           @@
##           master     #128   +/-   ##
=======================================
  Coverage   98.89%   98.89%           
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  Files          12       12           
  Lines        1084     1084           
  Branches      138      138           
=======================================
  Hits         1072     1072           
  Misses          6        6           
  Partials        6        6           

Flag	Coverage Δ
travis	98.89% <ø> (ø)

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