check mne version for _ensure_src

[codecov[bot]]

Codecov Report

Merging #16 into master will decrease coverage by 0.32%. The diff coverage is 75%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   90.97%   90.65%   -0.33%     
==========================================
  Files          10       10              
  Lines         532      535       +3     
  Branches       78       79       +1     
==========================================
+ Hits          484      485       +1     
- Misses         30       31       +1     
- Partials       18       19       +1

Impacted Files	Coverage Δ
groupmne/utils.py	79.46% <75%> (-1.27%)	:arrow_down:

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[hichamjanati]

Thanks @agramfort :)