MAINT: Only alter pybids config in legacy versions

[mgxd]

To remove the pesky import warning

FutureWarning: Setting 'extension_initial_dot' will be removed in pybids 0.16.
  warnings.warn("Setting 'extension_initial_dot' will be removed in pybids 0.16.",

[codecov-commenter]

Codecov Report

Merging #152 (30d34c1) into master (ec345c4) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master     #152   +/-   ##
=======================================
  Coverage   32.53%   32.54%           
=======================================
  Files          44       44           
  Lines        3642     3644    +2     
=======================================
+ Hits         1185     1186    +1     
- Misses       2457     2458    +1     

Impacted Files	Coverage Δ
nibabies/__init__.py	72.72% <66.66%> (-5.06%)	⬇️

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[effigies]

Sorry, maybe I should have given us a quiet minor series before announcing removal.